My husband have two sisters, one of them is single mom(Mila) and have one son (12 years old, let's call him Marco). In past, before my husband and I met, she was in bad condition, mental health issues. My husband, her son and she was living with their parents. But, when my husband proposed me, she left her home, and started new life with her boyfriend. Her son stayed with his grandparents and sometimes goes to his father (2 weeks of the month he would be there). Her parents was already struggling financially, my father in law doesn't work, only my mother in law, but for 600€. In Serbia where are we from, that isn't enough for bills and everything. My sister in law was trying to find job (but not so hard, like she didn't have damn about it) an her boyfriend have like 900€ salary. So she was in stable position to live with him. He has his own house, so he doesn't pay rent, only taxes, which is maybe around 100€ or less. I'm also single mom of two kids (girl 5yo, boy 3yo), I have two jobs and year before I meet my husband now, bought a house, but that house needs some renovation (around 5k€). So, my mom step in to care for my children while im on work (8h every day), and I was taking care of taxes, food (my mom also has job and salary of 600€) because my monthly income was 1200€ and more. When my husband proposed me, my parents in law insisted to start living together, so we did. My kids and I moved in with them. I found out later that month that I'm pregnant. My husband was working for 800€ salary and I stayed at home with kids (I have paid maternity leave for whole pregnancy and after my baby turn 2 years). So, our total income was 2000€. We took taxes, bils, food, everything on us, without any hesitation. My mother in law also joined us sometimes, but sometimes she give half of her salary to her daughter for food or clothes (for her and her son so she can be there for her child). We always understand her, she also help me with my kids. But when I was like 7 months pregnant, my husband has been fired from work and I was only one who provided for ur family, not including my mom in law. But then, Marco started to stay with us more often. Money for school or for clothes was from my mom in law. She paid for him everything, sometimes she didn't have enough, so I give it to him. One evening Mila came with her boyfriend on dinner and said something that I didn't like, but I ignored that. She was complimenting about how much her boyfriend earned that month and planning to go on vacation, but she didn't tell anything about her child. My husband, because in that time he was having more time, spend every day with me and my kids, but evenings with Marco playing games. I didn't mindes that, because I understood that he felt sorry for that kid. We never let him stay at home, while we go somewhere. But with that sentence that she said, my heart starts beating faster and in that moment I really wanted to say something not so nice. I know that if I say something, I would start a fight and that wasn't what I wanted. Next time when she came, Mila has expensive jewellery and clothes on her, but she came to ask her mother for more money for food. I stayed out of that, but my mom in law was like my best friend, so she complained about it. My husband finally find job when I was in 8 months, and his salary is 1800€, so we started to renovate my house for only us. In that time it was around Christmas. We bought some toys for our kids, and new PC for Marco (it was 600€). He was so happy. On Christmas eve my parents in law invited both my sisters in law and their boyfriend/husband. The other sister in law (Marie)is really nice and we have great connection, but Mila was completely opposite. While dinner her boyfriend said that he was fired because his company had some trouble. But later that night while I was talking with Marie about house and renovation, Mila stepped in and said "Oh, it's really easy for you, my brother works, he took great care of you and your kids. You can sit at home and do absolutely nothing. Oh, sorry, I forgot, you already did that for quite while.". I sarcastically said that she was right. I didn't want to fight on Christmas eve, and put that on side when I stay alone with her. While she was on that vacation, or any other day, her kid was taken care by us. She didn't even call him to ask him how he is, or does he need something. I gave birth on C section, it was rough, everything was hurting. But, I told everyone who wants to see baby and me to came when both of us felling well. I came home from hospital, I was so nervous, my kids wanted to kiss and hug a baby, but they are a little rough. I didn't even sit when I started crying, my husband was there and help me, but it was really hard for me. We was home for maybe 5 or 6 HOURS, not days, when doorbell rings. It was Mila. My brain exploded. Why would anyone normal think about visit a baby on that day when it came home from hospital? She goes directly in baby's room, took him without even asking me, kiss him directly on his forehead, nose and than she kissed him directly in mouth. I was so angry and I tooked my baby from her. I tell her to get out of baby's room. She looked at me and said she didn't want to do that, baby moved his head. Then I started a fight and told her everything that was on my heart and mind. I also told her that I don't want her near my children and my family. My husband and mother in law stepped on my side, but my father in law (who whole time was on our back, living his best life,not helping anything around house) take her side and said that she's sorry (she isn't) and she has rough past (depression) so we need to understand how she didn't mean it. I ignored him, but my husband didn't, and fight continued with them. I was so excited to be home with my husband and kids, to enjoy that first moments alone with them and then she came. My mom understood me, and didn't come that day, or day after, even if she wanted to see us. But she, she even didn't care about her kid, she wanted us to believe she care about her brother's kid. Month and a half has passed and we moved into our house. She called my mother in law to ask her to speak with me about everything and try to help her with that. Real reason for that wasn't our fight and her sorry, real reason was different. Marco stayed with her maybe 3 weeks, when he was there, he would be late for school because he go to bed at 3am and school is in 8am, but his mother wakes up at 1pm, she doesn't even care about Marco, his school, anything. She doesn't make him breakfast or any meal in the day, and he depends on money that his grandma gives him. So she wanted to ask me to take Marco to stay with us, so she can find some decent job. I didn't answer. I love that kid and of course isn't his fault that he's kid divorced parents and that he's mother doesn't want to take care of him, but I have 2 small tornadoes and baby. All 3 of them needs attention. Later that day Marie called me. She was talking to Mila, and Mila said how I am selfish because I don't want to help her and taking her brother on my side. It would be nice if I call her and say how sorry I am for everything. My husband called Mila and talked about everything, explained her situation and everything. But of course she didn't want to hear it, I'm for her the worst person that she can imagine her brother with, and he need to divorce me. Then he stopped talking with her ever since. Marco came on few hours one day but when I wasn't home and told my husband how he stay hungry after school till evening while her is in beaty salons. I felt very sorry and from that day he is with my in lows. I have brother and sister, I speak with them every day and I can't imagine our fight or to cut them if, so I insisted on that my husband stay in contact with her, but to keep her away from me. AITA for cutting her off and not taking her kid with us?