There's absolutely nothing wrong with potatoes as part of a balanced diet. They are actually very good for you. Your OP clearly knows zero about nutrition. The only people I have known personally to follow a diet similar to this is people who do strong man types of training - and then only for a certain period of time
It's not sustainable long term - and no 9 year old child should be eating a diet like this
What concerns me most about this is that either your OH took advice about his own diet and then imposed it on you and your child. Or he's picked up some random diet off the Internet and decided you should follow it
Go Google should a child be eating a carnivore diet. The answer is no. Kids should be eating fruit and veg. Not just berries because it's allowed on this kind of diet. I'm really stunned that you think this is ok for a 9 year old kid to be eating - it's not.
They should be eating bread and potatoes - its completely normal. They should also be allowed a treat now and then - chips, pizza, Chinese meal - not some clean eating brownie that your partner approves of
He knows fuck all about nutrition - that's very clear.
I suspect that when your husband or partner imposed this on your child he knew that there would be some kind of pushback from your kid and this kind of scenario would happen
I also think - why should everyone in a family have to sit and eat the same foods? It's completely normal for one person to like something that someone else doesn't. My mum loves celery. I hate it - even the smell of it makes me want to be sick
Your child isn't a mini version of you and your husband - he's got his own likes and his own tastes. The fact that your partner thinks it's ok for a 9 year old kid to have potatoes once a year is completely weird.
What would happen if you said I'm not following this diet anymore? Abuse?
Please phone or arrange to meet your mum - and tell her what's going on. All of it. The abuse. The name calling. Abusers get away with it because they beat people down so much with their cruelty and they think this kind of life is normal - they also thrive on the fact that they think no one will ever find out what they are doing. Tell your mum how bad he is - that's the first step.
I remember my mum telling me that my stepfather used to call her mental. He would abuse her and hit her and say she was mentally ill. Your partner already name calling you by text on your other posts.
You also have a baby who is going to grow up in this toxic mess if you don't leave him or get him to go