For what it’s worth, you have my sympathy. It does sound like he’s not interested in you as a person, but only in terms of what you can (and in his viewpoint, should) do for him.
The fact of the matter is that there are generally more females than males in his age group, and so he can probably find some poor widow (or spinster) who’s desperate enough to put up with him. Hell, maybe there’s some lonely woman who WANTS someone just like him. And I think that you should let him find her.
I feel that parents are owed respect…if they’ve done a decent job as parents. People who breed and then neglect or abuse their kids are NOT owed that respect, though. And it sounds like your father basically turned you out when you were an adult, and didn’t provide any support. Now that he wants support, I think that you don’t owe it to him.
Respect goes two ways. The parent-child relationship goes two ways. And I don’t give a damn about what the cultural norm is, I’m sure that there are plenty of Indian parents who DO give a damn about their kids. The cultural standards might be different, but I think that most people love their kids, and don’t cut them off when it’s convenient and then want to be supported in their old age.