Other people calling my baby their baby

Both of my partners sisters call my baby their baby. They'll message my partner and say where's my baby. Or they'll copy the photos I upload to facebook and put them on their facebook saying my baby doing this or my baby doing that. They'll even put those ridiculous "motherly" quotes with the photos even though neither of them have children. I told my partner I don't really like them putting a lot of the photos on their pages (because they have 1000+ friends whereas I have less than 200 because I only have people I really know and trust) and he got mad at me for trying to say what his family can or can't do. I've also walked into the room and one of his sisters was saying mama to our daughter which I just thought okay whatever, but then I walked in later and the sisters boyfriend was handing our daughter to her and said "go to mama." So I thought, do they actually have some weird thought in their mind that they are like mothers to her too??? via /r/Parenting https://ift.tt/2QSzCb6