I'm glad I read your story.
Your parent's annoyance is for one thing--self- preservation.
Parents are selfish when it comes to how their grandchildren look. Parents' ego is killing their children in the area I live. They want to see themselves in their grandchildren, or their money stayed in their community.
Your story is a lesson for immigrants' parenting styles and hate. Because everyone hates black people, even Black immigrants. Black Americans hate immigrants too.
What can I say? You know and understand everything. Your story is mine. I'm married from a different Nigerian culture, and family/friends hated me for that. I don't care about their foolishness for many decades. Our marriage lasted and thrived than some of the other people.
Three words. Love your wife. Love is a verb, and show them what you do with her. I admire how she handles your pain.
After mourning for a few years, your parents will come around and love and adore your children, but not your wife.
My suggestion, invite your parents to the wedding. Yes, they will not attend, but do your part.
Prayed for you and family. Be proud. Adults make tough decisions and get things done.