Why would you need your father's Domicile dude? .. .. Your father wouldn't have even worried about his domicile ever! You know how it was in old times. I guess you're worried about showing "Family Ties" .. Theres no need to over-do things. Go with the documents that you have. Remember:
Its the overall profile of the application that matters! .. Moreover, Father's PRC + Domicile is not part of the Visa Checklist anyway.