Double Trouble

It all started last year in October; I 23 went to my girlfriend's house. but she wasn't home. Her mother 38 divorced was and she had been drinking and one thing led to another, and I started fucking the mother. I enjoyed the sex so did the mother and we were still laying on the bed when my girlfriend 19 walked catching us both naked. She got upset and told me we were thru and so I went home. But at least I'd a fuck, but trouble soon raised it head as my girlfriend found out she was pregnant to me in the following week. The next month her mother had missed her period and would later test positive to being pregnant also. I'm a electrician by trade and well off financially as my family is wealthy and I've a trust fund and my own home. First problem was easy I would marry my girlfriend, as I was already to ask, but when I got caught after fucking her mother it didn't seem the right time somehow. Once married they both moved in with me, to my surprise my wife invited her mother into our bed. I now have 2 sons; my parents think my mother-in-law had a one-night stand and got pregnant. Also, we put my name on the birth certificate to give the child a father for appearance's sake. Whatever the baby has my name, and I may give him a full sibling yet as well. Mother-in-law lets me fuck her with or without my wife in bed with us.