My whole family is against my fiance

We've been together for 8 years and my dad never liked him because of his race. Everyone else barely tried to give him a chance. My grandpa hosts parties and invites people and my fiance promised he will come to my grandpas new years <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> dinner. We live in another state and traveling 5 hours isn't always easy when we have work commitments. My fiance's company told him last minute that they will be open and that he is needed on the job. So I left my poor fiance for 3 nights to make it to my grandpa's party. He told me he is so disappointed and lost all respect for my fiance because he broke a promise. I feel so bad now because no matter how hard we try to get support from my family someone ends up upset