Issues

I'm having problems with my in-laws

Ughhh...

So this started a few weeks ago, But I just recently spoked about it with my mother-in-law, I told her how I don't like the fact that she lets her 5 year old daughter , be alone with the baby without supervision , for example the other day I told my mother-in-law can you take care of my baby I'm gonna shower, and when I came out her daughter was in the living room with my baby by herself and my mother-in-law was in the kitchen and the time my mother-in-law took my baby to her room and left him alone with her daughter and I also told her how I don't like the fact that the girl ate hot chips then touched his face, or when her daughter was sick I told my mother-in-law that her daughter couldn't carry my baby because she was sick and the girl then coughed in my baby's face and then my mother-in-law said "ohh it's good if he gets sick" like wtf what kinda person thinks like that he's a new born.

Then after that talk I had with her , the next day my husband talks to me and asks me why I won't let his sister carry the baby I then explained everything to him so he understood.

And just yesterday I went to visit my mom ,and when I got home my husband was telling me that I have to let his sister carry the baby , because his parents got really mad at him , and my in-laws said "after all the help we gave y'all this is how y'all pay us" I mean I'm grateful for everything that they have done for us, but I just want them to respect my decision, its my baby I'm his mom and I should do anything and everything to protect my baby , i mean i had no problem at first but once I saw that they left the girl alone with my baby that's when I started having a problem with it i hope someone understands me , I wouldn't want anything to happen to my baby.

Can anyone give me advice on what to do, I wouldn't want to have a bad relationship with my in-laws