I’m being gifted a house from my dad as inheritance AITA if I take him up on the offer?

My dad last night at the family gathering stated if me and my partner wanted to along with our 2 kids – move into his house he rents out as long as long as we pay rent for 5 years he will then sign the house over. This house is worth over £400k!
How bloody amazing and grateful I am, is beyond words and truly amazing to be with out a mortgage and roof over our heads by the time we are 40yrs old!!
My partner couldn’t look more ungrateful and unhappy if he tried 
I said thank you so much to my dad for the lovely offer!
My partner stood in silence.
Everyone – my aunt and mum all said wow why don’t you take him on that offer! Granted me and my partner don’t want to leave the area we are in but it’s rented- we pay £1500per month for a small house.
My dad wants £1000pm for a bigger house.
But a bit of a less desirable area due to being quite congested and where we are is lovely countryside.
But it’s 5 years! We could do so much.
I leave it until the morning to talk to him…
I say this morning ‘I think I would really like to take my dad up on his offer’
My partner states back- no, so you can be financially stable and leave me? You would kick me and my dog out of even tell me to leave my dog behind as it’ll be your house, we aren’t moving’
Back story on the dog… his dog bites, since having children I’ve kept the dog separate but I still clean the dog, hoover and wash his area! My partner doesn’t walk him, care for him and barely feeds him! I’ve told him to rehome or give the dog to his mum so he can be looked after! He argues with me.. it’s been such a big issue in our relationship.
So I said maybe yes I would say the dog can’t come, I will have a newborn and I don’t want a dog that bites around my children.
He said then he isn’t going to support this decision. He would rather live with his dog at this rented house and let me and the kids go.
I said ARE YOU SERIOUS?! You’re going to choose your dog over me and your children?!
He said well you won’t let my dog come so yes.
I haven’t stopped crying.. his called me names, told me I’m selfish.. that this was some big plan that I have to leave him and be stable.. I’m actually gobsmacked.
Am I the a*se for wanting to take this opportunity for me and the kids??
Should I be choosing my partner and staying put?
I’m honestly so confused by his reaction and disgraceful behaviour towards me and his children and this offer!!
What would you all do?!
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