Parents won't let me paint my kitchen cupboards

[Forfucksake84]

I currently rent a flat off my parents. I have 2 children and have outgrown the flat and my parents have bought a bigger house to accommodate us. I will still be paying rent, and will be having a rent increase. I'm incredibly grateful that my parents have helped me into a bigger home but I feel they (particularly my dad) are being quite controlling about the small adjustments I would like to make to it. When we first looked at the house they agreed to me painting the kitchen cupboards when I move in. At the moment they are a boring mdf colour and I wanted to paint them a nice light grey. My dad has now backtracked and said that they don't want them done at all, and that they are fine as they are but has given no reason for it. I just don't understand how it would affect them as it won't be them living there! He reluctantly agreed to remove the carpets in the bathrooms as I said it was a hygiene issue but even that was a struggle. He keeps reminding me that he is the landlord and that I need to ge permission to do anything but it feels like he is treating the house as an asset and me as a tenant rather than his daughter and I really feel like I'm not allowed to make any changes at all. Im due to move in in 3 weeks and it's making g me not want to move in at all...
For reference I am 40 and my parents re in their mid 70s

Cover the cupboards in removable vinyl. It causes no damage.

Not strictly true. Some are better than others-but some absolutely do cause damage and can be a nightmare to remove.

Plus-a lot of it looks awful.

I agree with the idea of getting wraps put on the cupboard doors. These can then be removed and the cupboards returned to the current boring colour if the house ever needs to be sold.

I used a vinyl wrap in a house I was selling where I didn't have budget for a professional refit, but only on counter end-panels not on doors. It was pretty easy if you are slow and careful.