What should I say to my family?

Lately my girlfriend and my dad has not been getting along. My dad think I shouldn't be dating a white girl and I should find a black girl to date. The problem is I've been dating this girl for over 2 years and my dad and mom still doesn't like her. My girlfriend and I want to start a family soon and we don't know how to tell them. Whole family love and respect our relationship so they have no problem with it. My brother is the only one who doesn't mind that I'm in a interracial relationships. How do I tell my family that me and my girlfriend wants to start a family of our own without them getting any more pissed at me
What should I say to my family?
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