I fathered my own Brother

When I was 20 and the oldest of 3 my parents were always fighting over something or another. Then they would get drunk and sleep together and next day it was calm for day or so. Then back to fighting, after one of these fights my father Paul left the house after he had been drinking. My mother Linda then 38 had also been drinking and had passed out and didn't know Paul had left the house. She awoke later and I was in the shower and she came in thinking I was Paul and joined me in the shower. She wanted sex and she wasn't really with it you could say, thinking I was Paul. I got aroused by her playing with my cock and stroking my body, so I fucked her in the shower. after we went to her bed and fucked again. Then she fell asleep and I went and showered again, Paul returned shortly after I had finished and joined Linda in bed. He was totally smashed and had been drinking whiskey at a bar, he had left to get whiskey as there was only beer in the house at the time. Next day neither knew what had happened the day before and they followed the usual routine after their previous day fighting. Linda assumed she had been fucked by Paul and Paul couldn't remember what he had done. Anyway later on Linda realized she hadn't been protected and that started another fight. With no beer or whiskey in the house, Paul left to go to the bar and Linda just sat watching T V. Weeks later Linda tested positive to being pregnant and she would have my youngest brother David as a result. Then four years later Paul and Linda divorced and Linda got custody of my 3 siblings. I had already left home and was at university and hardly visited due the constant fighting. I now have a family of my own and don't drink at all. Neither Paul or Linda know I'm the father of David and I'm not about to tell either of them. Paul always had a great paying job and Linda was left fairly well off after the divorce. Neither have remarried and enjoy their 11 grandchildren. I'm Duncan now 39 and have 3 children of my own, 4 if you count David.