Hello "confused".
Being a bloke of Indian background myself, I never imagined circumstances like the one that you'e been in. I only heard it from non-indian women in a relationship with an Indian guy. But after reading so much about the inter-racial issues on the internet, I've had to re-adjust to this reality of non acceptance of an Indian family and other difficulties faced by the couple.
Anyway, specific to your case -it appears that his father remains unconvinced to see you as a daughter-in-law and the bloke seem powerless infront of his dad. In short I'd say:
1.) Find out how genuine this bloke's feelings are. I now as stupid and mean as it may sound, practically speaking if a guy who insists on loving you for the rest of his life cannot stand up to an adversity prior to you being formally 'signed to his name', he probably is not confident himself.
2.) Once you know of his feelings (perhaps you already do), you may want to 'devise a plan'. That is correct-devise a plan. By that I mean, you'd need to identify (through this guy) who holds the key to this family's 'internal affairs'. If its the father, you may want to try to understand and clarify his stance as to why he remains reluctant in accepting you. Once you have those reasons, I suggest you and your partner get together and try to engage the father and have a very frank open discussion to target his concerns.
Without knowing much about this family and their background, I'd say usually Indian parents (regardless of whether they have lived in India, UAE or elsewhere) from the early generation (born 1930s -1970s) tend to maintain a conservative view of non-Indian women. For them a caucasian female is perhaps going to be :
1.) Uncaring towards them in their hour of need as they get old
2.) Not be so domesticated as their traditional mail order bride from India. (ofcourse not all Indian brides these days are submissive)
3.) Will not adjust to their cultural set up which may include their views defined/based on religious hardlines such as not eating beef or cooking in a certain way or certain foods etc
4.) The offspring -their grandkids will not be 100% Indian in their brought up etc.
Now ofcourse any sensible educated being regardless of their background wouldn't give a hoot about the above 4 as long as you yourself are a good human being in general, love your partner and care about your in-laws and your future (being your kids) which most people do. Such acts are not bound by any religion, race or culture. Its purely human nature.
If your efforts fail to counter the above, I'd say that you try (and i know this is harsh and perhaps the toughest test of life), from a practical viewpoint, to re-evaluate your commitment to someone where your life is only appearing to be full of disappointments. You dont have to put yourself through misery simply because you've loved someone whom you cannot have. I would say -you let go and re-establish yourself with someone and something that is worth your efforts.
Hope it helps and things work out.