Hi everyone. Apologies if This in wrong place, I'm new here. I would love some advice please.

My partner recently moved in with me & my 3 daughters. I own my own house, I work and I've brought the girls up alone for past 7 years. We have been used to being an all girl house.

My two youngest (14 and 10)have Autism & don't do well with change but have adjusted really well to my new partner who is amazing with them. The problem is his son and his ex wife.