DH kids from previous marriage refuse to meet our SON. its been ten years. My son is asking why they dont want to meet him.

DH left ex wife and we met 6 months later for some reason his kids hate me. I never ruined the marriage between him and his wife as she was abusive and he wanted out. He left when they were in college. 

Anyway, its very heartbreaking to me that they have ZERO interst in their brother.

I tried to contact them and asked if they would like to meet but no reply.