I am a single father of 3 kids, 16, 13, and 11. I live alone and get them every other weekend. Divorced for 8 years. I have been dating this girl for about 2 months. She has a 3 yo daughter. She recently got into a fight with her mom and was kicked out with her daughter. I told them they could stay with me, as she had nowhere else to go. My ex wife FREAKED out and we had a big argument about it. She doesn't want this girl there while my kids visit. But she has nowhere else to go and I feel so bad for her and her daughter. Any advice?