other halfs family..

I'm so done with my OH's family.. they didn't believe I was pregnant when we told them,his sister ran off crying because 'she's the eldest and should've been first',his mum just didn't seem bothered... 
Now,we are 37 weeks in.. his sister is now 12 weeks pregnant,with no steady income,no room in their car for the baby (it's two seats),no room in her flat (the wardrobe is in the lounge section) they 'planned' to get pregnant but not this soon.. we'll use protection if you're not ready!?
My OH and our baby have been completely ignored the last couple of months,my OH feels crap about it because his parents aren't excited,they make us feel like our boy was a mistake when he was very carefully planned! 
They're waiting for us to hand them all our stuff when we are done.. well we won't,we are having another baby at some point. They don't want to spend money on it and they're already planning nights out when there baby will be 2 weeks old.. if born on time!?
Sorry,I'm just ranting 😡😡