DEAR ABBY: My older sister, “Lily,” is in a biracial marriage and has a son. Our dad never approved. He gave her an ultimatum when she first met “Rodney”: Choose between him or our family. She chose Rodney. After 30 years of Dad not speaking to her and influencing us siblings to feel the same way, our mother died and Dad rekindled his relationship with Lily. He’s 82 now, and he puts her and her family first. He spends a lot of money on them and spends a lot of time with her and her son. The rest of us ...