My uncle David was never mentioned

Growing up in a close nit family, I thought I knew every relative. But when my grandmother got very ill, she wanted to see David. David who I thought having never heard of David before and it then all came out. David was an uncle and oldest of my mother's siblings. I was told he was exiled from the family, for doing something really bad and not related to me. my mother was the second oldest of 4 and David was the older than her by 2 years. That would make him 57 I reasoned, my mother nor the rest of her side of family wanted to find David to fulfill their mother wish. I'm an independent mined person and decided to find him for my grandmother. No chance of get information from my mother or the others, so I looked up the family in the records office. Which is also where I work, and I started a search and I found just about everything except why he was exiled and where he was now. I done internet searches and after a few weeks got a lead, it was several years old. But I was closer than I had been before, also my grandmother had recovered. But was still very weak and frail and I decided to ask her about my uncle David when we were alone. At first, she was nervous incase the others found out, but finally told me everything about David up until he left. His crime was marrying the daughter of his father's worst enemy and neither family wanted such a traitor in their family, both David and his wife Betty were expelled from their families. Seems stupid to me, but grudges are deeply held in these parts. I then got an address for David and his family in the city, which was good as my grandmother had to go there for tests. I arranged to take as my mother had to help with the family business and I could get away easier. After her tests we were to stay in a motel, I had his address not his phone number and decided we would just turn up and see how it went. We both got a huge shock as the house was a mansion and I knocked, and maid answered the door and I asked to see David by name and said I was his niece, and my grandmother was his mother. I thought he must be a servant and expected to be sent around to the back door. But we were taken into what she called the drawing room and a short time later a man entered. He was happy to see his mother and she him, we had dinner with them and stayed the night there also. David drove us home and had made up his mind to settle the issue as he called it with the families, Betty was also with us. The families were shocked to see them again and after some heated discussions, all was forgiven and would be buried fully overtime. Some changes followed of course. I got a job working for my uncle David and his mother now lives with him due to her health problems as do I, my mother and the rest do visit and so does Betty's family. Main reason the grudge was buried nobody can remember what started it in the first place and they were fighting over nothing as it was forgotten before I was born what it was all about. But the best thing is my grandmother is happy.