I think that's wonderful.
In the best of all possible worlds, you and your wife could hold your head high, you could do your best to not judge, and indicate that you are open to re-establishing good relations with all who may not have accepted the two of you the last time around. This may take a lot thought and effort.
Your cousin sounds like a remarkable person.
In the Course in Miracles, it says that the holiest place on earth is the place where former enemies have become friends. Png, I wish you only the best.
Peace and Love, Bruce Chris
"Christianity is not about what you believe, it is about how you treat other people; - with God's love"