Would you be annoyed if someone took a nap with your child while babysitting ?

When my son was about a month old my sister in law came over one day after school to visit with the baby. After feeding him she rocked him to sleep and then mentioned she was tired. My husband told her to go lay down and take a nap. She said she wanted to cuddle with the baby so he told her to go lay in our bed with the baby and nap while he was napping. When I walked in and he told me they were sleeping in our bed i immediately told him that was completely inappropriate and I was not comfortable with this at all. I explained to him that we don’t even sleep in the bed with our son why would he think it was ok for anyone else to. I don’t care if it’s him family or not. I promptly went into the room and removed my sleeping son from the bed and put him in his bassinet Next to the bed. Afterwards we had a long conversation and he apologized said he wasn’t thinking. Fast forward to today. I’m working and my husband leaves for work about an hour before I come home so his mother is over to watch the baby and fill in the cap until I get home. She usually comes over earlier in the day so my husband can shower and have time to get ready for work. I call on my lunch break and he proceeded to tell me how his mother took a nap with the baby on his bedroom floor and how the baby slept for a long time next to her. Now I’m annoyed I’ve told his mother several times that I don’t want her holding the baby while he sleeps. She argued with me a lot in the beginning and I made it very clear he sleeps fine on his own and he does not need to be held. I also already had this conversation with my husband the first time it happened with his sister. So now I’m annoyed we already agreed on this matter why would he let his mother take a nap with the baby. His excuse was that was months ago we had hat conversation and the baby is bigger now. My son is 6 months old and I still do not want anyone taking a nap with him. He has a routine and a schedule he sleeps in his crib. To me it wouldn’t matter if he was 6 month a year or two years. I think it’s extremely Inappropriate and not ok at all. My son is not a toy or a stuffed animal or them to cuddle with just because they want to. Also I think anyone who is there babysitting should be watching the baby and not taking naps. I wouldn’t be ok with it if it was my mother or sister either.