I Refused to Share My $400K Lottery Winnings With My Family

For one mother, her MIL’s actions went so far that walking away was the only option. Now, caught in a whirlwind of family drama, she’s forced to make a tough decision—stand her ground or apologize to keep the peace.
My mother-in-law and I have a pretty great relationship, and I love her, but sometimes I just feel like she thinks a lot less of me than her biological children.
My 8-month-old baby recently went through some health problems and lost quite a bit of weight, but her doctor had no problem with it because she was quite chunky before, and it just wasn’t a concern. She said it’s normal for them to lose weight when sick. My baby is healthy again now.
I breastfeed her, and my mother-in-law says that I don’t have enough milk for my baby, and that’s why she keeps unlatching (I think it’s just that she gets distracted easily, and as soon as she hears something, she wants to see what it is). She told me that I need to start giving her formula or feed her my SIL’s milk because she apparently has very fatty milk.
I told her no and that I know I have enough milk. When I pump, I pump about 16 ounces per session, and when I let it stand, there is a lot of fat at the top.
Okay, now here is where I got upset. She told my SIL about it, and she brought milk to my mother-in-law's house behind my back. One day, while I was cleaning up her house, she was watching my kids so that I could clean in peace and get it done quicker.
Once I finished, I went to her room, and there she was feeding my baby with my SIL's milk. I got really upset. I told her that I had just fed the baby an hour ago and that I had asked her not to feed her anything. She said she was crying and very hungry, and she’s too skinny. I took my kids and went home right away.
My SIL and MIL have all texted me saying I was rude to just leave like that without saying anything and that I’m overreacting. My husband is also very upset with his mother because he said she has never been supportive of my breastfeeding because my daughter had so many foods I needed to avoid.
Another one of my SILs texted me saying I’m not welcome at her house anymore until I apologize to my MIL because she was very hurt by me. I honestly don’t know if I overreacted because I’m sensitive about the subject, or if my mother-in-law is just trying to act like the victim.
My baby also has a dairy and soy allergy. Last time I had any, she got a severe reaction, which ended up causing a whole bunch more health issues that we dealt with for 5 months. We just got done with it all, and it is very scary to me that she would do this.
Sometimes, the dangers of disregarding a mother’s boundaries aren't always clear. For example, in this story, what seemed like a harmless kiss from a well-meaning adult ended up causing a serious complication for a child, who now faces the possibility of losing an eye.