Split Family

My father had only one sibling an older brother who he didn't get on with. My uncle had done very well and was rich compared to us. My father owned his home and worked as a mechanic and was happily married with 3 children, I being the youngest at 22. My uncle had no children and married late and wanted to start a family at the age of 61. His wife was only 32 and my uncle had a prenup insisting she provide him with a child. No pregnancy followed their marriage and he became restless, she was desperate. I've an older brother and sister both married and have their own families and I live at home still and a mechanic like my father. I do okay dating, nothing special in looks or build. I got to know my aunt thru a friend of hers who I'd fixed her car. My family weren't on speaking terms with my uncle and so we didn't meet, unless it couldn't be avoided like a funeral. Anyway I started to see my aunt often and we got on fairly well, this was before she married my uncle. But we stayed in touch, nothing sexual just being friends. Anyway, as her marriage proceeded and no baby, my uncle was getting annoyed by her failure. It couldn't be him as he is perfect. Anyway, she got every test going and she was fine no problems. No chance he getting tested, so she was in a fix. Our secret friendship still going on and we would meet every now and then. Finally she asked me would I get her pregnant, as she saw it I was her last and only hope. I was shocked of course, but also excited. She wasn't anything special either, but I would be getting one up my uncle albeit not able to tell him. Years of siding with my father, made me accept to get one over my arrogant uncle. Also I never refuse a fuck, the next time she had sex with him. She called me and we had sex twice and that what happen each time until she got pregnant. Of course I had a DNA test done to see if I was the father, using my uncle's name. He being the suspicious type also got a test done, it arrived for him and he was away. We checked it and he wasn't the father and test results folder returned to the envelope with only one sheet changed the DNA test result page. We put mine in place of his, all the details were on the folder and only his name nothing was on the page. Using my uncle's name meant it fitted as good as the original. Carefully resealing the envelope and on his return he was happy not that he was having a son like he wanted. But he was going to be a father. That was 2017 and in 2018 a healthy baby girl was born and in 2019 he wanted to start trying for a son. Not a baby but a son was all he wanted, his health was worst than it was before and my aunt again asked me for help. I was engaged at the time, but still agreed and she got pregnant quicker this time. My uncle never bothered with testing this time as he was hardly away and she was always fairly close by. But he did have afternoon naps and thus I got my aunt while he slept. The doctors said it was indeed a boy and he was happy. The son was born in late August 2020 and my uncle not one for taking any directions. So he caught the Covid Virus and with his ill health he died several months later. My aunt is regular visitor to my house and parent's house now, the family split is gone.