Dear OP,
I don't think you're being unreasonable at all.. My MIL is exactly the same and I too am also looking for advice on how to handle this situation.
When I was pregnant she dictated everything from what furniture/clothes my baby would wear, his name and his religion which has caused huge arguments between myself and DP. She bought his pram and REFUSED POINT BLANK to let my mum buy it even though she knew she wanted to. Then when my mum said she was going to buy my sons cot for his bedroom. She tried to make me take my DPs cot from when he was a baby, said that it would save my mum and dad some money! My mum and dad are far better off financially than she is!! My brother in law bought us a crib for my son without asking was this ok. My sister had said she was going to get us a Moses basket, MIL told me to tell my sister not to get me the Moses basket as I wouldn't need it due to BIL buying the crib and her buying the pram. She told me to ask her to buy me a travel cot instead! I put my foot down with this one, said she had already made me say to my mum about the pram and caused a fallout there, I wasn't telling my sister not to get me something now too! She said I was being stupid! She said I was just the surrogate and that I had to share the baby with her because she lost her sister last year and the baby coming was her way to be happy again! I feel for her that she lost her sister but me having a baby was not her way of finding happiness I wasn't having him for her I was having him for myself!! She even interfered when me and DP were talking about finding out Sex of baby and told DP we weren't allowed to because it would ruin the surprise. We didn't end up finding out to keep her happy! Which I was raging about, I wanted to know if it was a girl or a boy, if it was a boy I would have to give him my DPs name and I wanted a bit of time to get used to this and get his name printed on stuff so I could get used to him being called after DP! On the first anniversary of her sisters death we had agreed that we would announce our pregnancy news to DPs family at a family meal to make the day more bearable for his mum. She then took it upon herself to send everybody a text that day and tell them our news!! Even though we had agreed to wait till the gathering and tell it together!!
When baby was born she didn't leave the hospital for the whole three days I was in, when my family came to visit me in hospital DPs family didn't even have the decency to clear the hospital room and let me speak to them. I also had to ask MIL to give my son to my mum so she could hold him for the first time. The night I came home from hospital DPs family were waiting in my house for us and didn't leave again until 1AM! I so wanted to come home and enjoy my new family after a really traumatic Labour/time in hospital. I will never get that night back again to enjoy with my new family. Everytime she came to visit she was snatching my son off me even if I was feeding him, even one day she came in and he was crying and she snatched him from me and said "what's she doing to you my boy" I honestly wanted to claw her eyes out!! She smokes so when she wanted to go for a smoke and put my son down she would go around everyone in the room asking do they want to hold him even though I would be saying to her to give him to me!! She just ignored me like I wasn't there. One day she done it I lost it and said could you just give him to me he's my son! When she got home she text my DP and said I had really hurt her feelings with how rude I was 😡 and of course DP took her side and said I was an unfit mother! Just one of the many names I have been called by him for confronting about her behaviour!!
I was going to have my son Christened in my DPs Religion to stop arguments because I didn't have the energy to fight about it when I was pregnant. But it must have been hormones that made me wake up and smell the coffee and realise that I was making a huge mistake in order to please others and I would have lived to regret it. So I decided against having him christened. MIL went off on one! Called me all the nastiest names under the sun and said some pretty unforgivable things about my family circumstances (I was brought up in foster care) and she refuses to apologise because she says it's my own fault!
I didn't think I was being unreasonable. I had already given my son my DPs first name against my will in order to keep with their family traditions. I didn't think I should have to give him their religion too when my religion and what I wanted was not even being considered.
She has said to DP that I'm trying to stop her bonding with baby because I have "mummy issues" due to being brought up in foster care which couldn't be further from the truth as I have a great relationship with my foster mum and couldn't care less about my biological mum as she doesn't care about me!
MIL and I have only just started speaking again after this and it was only because of Christmas. But I still feel sick everytime I'm in her company. Can feel my blood boiling when she lifts my son or when he smiles at her. My DP doesn't want to hear it anymore because he thinks the sun shines out of his mum's bum, he just doesn't realise she is nothing but a narcissist!! If anyone has any advice on how to handle this crazy lady please throw it my way!!