Have to be pacient with them, be kind and do nice things for them and complement them, it may take a little time, but they will warm up to you and start to like you more. Be with them and their mom, and just try to be a good parent and it will all work out in the end.
just take them out for dinner or buy them video game you know kids stuff and yeah last but not the least do conversation as we all know conversation is the key success bust of luck!! hope thats its help
They are always going to think that. The best thing is to make the relationship last and be good to their mother and stay out of their relationship with their father. It's too soon to expect acceptance from a real family with any kind of loyalty.