My sister in law is a mum herself and I generally get on with her well. She sometimes oversteps boundaries though and she once gave my son a big piece apple when he was about 6 months old without asking, and he started coughing and I had to take it out his mouth.
My husband has recently said that she would like to look after our son (who is now almost 2) and it would give us chance to have some date nights/days.
I just don't feel 100% comfortable though and I'm not sure if I'd spend the time away worrying.
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No is a complete sentence and if you don’t want her to then you don’t want her to. You don’t need a reason, even though you definitely have one.

I wouldn't personally hold one stupid mistake from 1.5 years ago against her, but if it's a safety issue or a lot of overstepping rather than just different parenting styles I don't think it's worth it. If you can't trust that she won't listen to the important instructions and keep him safe she's not a good person to leave your child with. I'd explain to your husband that you wouldn't be able to relax and enjoy any time away because of her track record, you would just be worried what was going on.
However she is a mum, you say you get on well, does she have a good relationship with your son? Idk the nature of the other overstepping issues but this alone to me wouldn't be enough of a reason to say no to the offer, especially if she learned from it and hasn't repeatedly done the same things again and again.

How old are her children?

It easy to forget when your kids are older what they can at can’t eat as certain months. You can always try it and see how it goes unless you have other concerns you’ve not mentioned. It will be good for him to build stronger relationships with his cousins and aunt