A little context so I try not to drip feed:
My mother-in-law was an only child so she's used to getting what she wants and this has carried on throughout her adult life. She has two children and was quite a strict parent. She and my husband's dad got divorced about 10 years ago when the kids are all grown up. She's living quite a luxurious lifestyle travelling about a lot but gets annoyed when my husband doesn't ring on at least three times a week to say hi. When we got married my husband made a point of living in the same area as her so she wouldn't get lonely.......
Anyway me and her son got married a couple of years ago and we now have a baby. And she constantly refers to my baby as our baby. This annoyed me a bit as I grew up with a lot of children and it's my first baby so it's a big deal for me ! Yes she is the grandmother and it's her family too so I brushed the our bits off thinking I was being silly....
But am I being unreasonable to get annoyed when she starts saying "my baby my baby" when she's talking about... well my baby not hers?? X