I got my mother in law Pregnant

Last April my wife went into hospital to have our first child, Susan 20 and I were married in 2020 after she got pregnant and started living with her mother Harriet 36 never married, Susan has never met her father as he didn't hang around long after Harriet got pregnant with her. I'm George 22 and going to university and met Susan and started dating and then fucking and we weren't careful and she got pregnant. So we married and I still went to university and my parents bought us a house close to the university to live in. My family is well off and I will have access to a my trust fund after passing university. It's the condition of the trust fund. I've always done well at school and haven't had any problems at university with my courses. My father Randall and mother Christine have 4 children and I'm the youngest. Susan wasn't going to the university and was working at book store and I started to visit it to talk to her and finally got her to date me. I liked her a great deal before I started to bed her and got her pregnant. Anyway when Susan went into the hospital my whole family came to town to see the new addition a boy named Randall after my father and his father before him and just by chance his and Christine's first grandchild, another from my sister Margaret is due next month. Both were really happy with there first grandchild and they love Susan as their daughter in law. Anyway the drinks flowed and later that night I was at home only with Harriet and we both had a fair bit to drink and we ended up fucking and fucking again next morning. I could we were drunk and didn't know what we were doing, but we had been fucking for months and Harriet sharing my bed with Susan an me. Susan and Harriet are really close and the threesomes started around Christmas and have continued ever since. But we weren't as careful as before, neither Susan and Harriet take the pill and so we practice safe sex. Except on that night, I know it only takes one fuck and woman can get pregnant. But I know from other people saying how they been trying for awhile to have a baby and it took them more then one or two fucks to get a baby. But of course you can get pregnant from just one fuck and we must have done it just at the right time. My mother Christine returned to visit us again in June and stayed with us. She soon picked up on Harriet's distraction and Christine is a very smart woman, once she knew Harriet was pregnant. She put one and one together and asked me straight out about being the father, at first away from Susan and Harriet. But on hearing I was the father told both Susan and Harriet she would keep their secret from everyone except Randall. But Randall also told us it was a family secret and not even my siblings needed to know. My career in the family company is part of my life's plan and Randall and Christine will setup family trust for all their grandchildren including Harriet and mine. Margaret is also having a boy and Harriet is now known to be a girl much to the delight of Christine. Harriet still shares my bed with Susan and me, except for the moment as she and Susan are visiting Randall and Christine with baby Randall. Christine and Margaret and them are hitting the stores big time I've been told by my father Randall. But they will be back home Saturday.