if your sister didnt fight it wen he was making advances..and she took those drinks on her own..then it's really not totally his fault she got pregnant. B4 she had the abortion..did she tell him about it? I feel bad for her and all, but dont blame it all on him..blame him for the abortion...and make him pay for that, but remember it takes 2 to tango...
i am not trying to b mean...so dont get mad
also, calling him constantly wont do much, so try to find another LEGAL way of getting a hold of him..maybe at his job? Is there any way to prove that baby was his? it would b hard to get him to pay if there's not proof