Perils of Alcohol

Last January 3, I (25) was still celebrating the new year and drinking heavily. My wife (20) who was pregnant didn't drink for fear of harming the baby. So, I was drinking with mother-in-law 39 (mil) who lives with us since her divorce. We kept drinking my wife went out with my mother and sister shopping for baby things. Well short version is I don't know or when we decided to fuck, but we did. My mil and me had sex and were still in bed together when my wife returned. She wasn't upset that I had fucked her mother as we had been doing it since she moved in 2021. Mainly threesomes, but as of then just me and my mil. As my wife was getting very close to having the baby (arrived 2 February), but she noticed one thing out of the normal routine in our sexual relations. No condom or empty packet of a condom, a quick investigation showed my cum seeping out of her mother's pussy. Now my mother-in-law is pregnant to me, which my wife finds hilarious and says she always wanted a sister, now that she knows her mother is having a girl. My parents don't know who fathered her baby and we are keeping it quiet.