I (29F) have a 6-year-old son, and I’ve been raising him mostly on my own since his dad left when he was a baby. My younger sister (26F) lives nearby and has been helpful, especially when I needed last-minute babysitting or help during tough times. I truly appreciate her support, but recently she’s started crossing some boundaries, and it’s getting out of hand.

It started with little things—like giving my son candy before dinner or letting him stay up past his bedtime when he was over at her place. I addressed those things gently, thinking she might not realize how it affects his routine. But then she began correcting me in front of him, saying things like “Oh, you’re being too harsh” or “Come on, let him have some fun.” Last week, she even told him he didn’t have to finish his homework if he didn’t feel like it—directly contradicting what I had just told him minutes earlier.

The final straw was when we were at a family dinner, and I told my son he couldn’t have dessert until he finished his vegetables. My sister loudly said, “That’s such an old-school rule, come here sweetie, Auntie will get you some cake.” I snapped and told her, “You’re not his second mom. Stop overriding me like I don’t know how to raise my own kid.”

She got really upset and said I was being ungrateful after everything she’s done for me and my son. My parents were split—my mom said I was right to stand my ground, but my dad thinks I could’ve handled it more privately. My sister hasn’t spoken to me since, and now I feel guilty, like I ruined a good relationship.

So, AITA for setting that boundary with my sister, or should I have just let it slide to keep the peace?