In the OP's case,looks he has substantial money
That's a bit of an assumption. The fact that he sold a property doesn't mean he has money. Most people have mortgages and don't get the entire proceeds of the sale as they have to pay off the bank first. He also specifies 'finance taken in my name'. So I doubt that he has a lot of cash to spend on expensive legal proceedings.
In one case he proved that she is a unfit mother
There is nothing in the OP's post to suggest that his girlfriend is an unfit mother. That's quite extreme. If she's just a normal, ordinary young woman, then his chances of getting custody are virtually zero.
Polish actress Kasia Figura & kai
Sorry I don't pay any attention to celebs :))