Family issues

Hello everyone,

My parents divorced few years ago with almost no communication between themselves anymore.
About a year ago, my mom has started a new relationship which had helped her moving on in her life. However when my dad learnt about my mom's new partner, his reaction was very negative disapproving him mainly because of his skin color.

Two months ago, my sister also started a new relationship with an African boyfriend. Sadly my dad has stopped to communicate with my sister as well.

As per myself, I am still talking to him but my position is obviously not so simple. I am feeling pressured being in the middle of everyone.
Has anyone experienced anything similar?

Thank you