Overbearing in laws

Does anyone feel like they never get a minute from their in laws since having a baby. My MIL works part time and her daughter was made redundant the same month my lo was born (great timing 🙄) anytime the mil is off work the two of them land round and want to see him. I'm sick of the sight of them. Ontop of that the sister in law is very introvert. She's almost 40, stills lives with her parents, has no friends and no fire to do something with her own life. I feel like she's living through us and her mum's enabling it. I honestly think she's thinks my lo is hers and again her mum pushes it. They have said things like my lo is the closest I'll get to having my own son. They are talking about taking him on holidays.Giving each other presents at special occasions from my lo (even though my husband and I already have) Buying necklaces for each other with his name on them and the sister in law even got her nails done and got his name painted on it - is it just me or is this weird? I've spoken to my husband about it but nothing has changed. I know they mean well but just with the way they act it's starting to get to me. Am I just being weird about it all or what do you think. I feel like it's ruining my maternity leave.