<human>: Can you give me the gist of the text in a nutshell?

My MIL and I have a great relationship. She's been my mother figure since I was 18 and had my daughter because my own mother is two states away. But we've always clashed when it comes to parenting choices. She gives my daughter fast food, soda, and used to put sugar and vanilla in her milk when she was an infant. Whatever, we resolved those issues. Her and I are very close. 

She knows about the incidents where I was molested numerous times (one was from a family member) when I was a kid. So when she told me my daughter was sleeping in the same bed as her 12 year old son, it rubbed me the wrong way. He is a good kid and I know he loves my daughter very much, but I am not comfortable with my toddler sleeping in the same bed as an almost-teenager. I told her this and she got defensive about her son (which I can understand) and just disregarded my feelings. 

I haven't let my daughter sleep over since, because MIL said she can't guarantee where my daughter ends up falling asleep. It sucks, because my daughter loves her grandma and has been asking when she's going to go over there again.
<bot>: I'm uncomfortable with my toddler sleeping in bed with her teenaged uncle because of issues I've had as a kid. Am I overreacting and being prejudice because of what happened to me? Or is this totally justified?