I’ve experienced many of these things with my grown children. We bought one of them a house, and a sibling grew upset although we had offered to buy her some land but she had turned us down. Also, my son’s wife hated us but I kept reaching out to her, never criticized, accepted her unconditionally, and this is what finally led to my son divorcing her. He realized she was hating us unreasonably when we had done nothing wrong. He’s now married to a wonderful person.