Husband slept with my mom and got her pregnant 😭🤮

I’m going anonymous because I’m extremely embarrassed and a few friends follow me on here, I’m not quite ready to break the news yet that I’m getting a divorce.. this past Sunday evening I went over to a friends house to help setup her nursery while my husband was supposed to be helping my mom with the kids. I came home around 7 pm (only a little earlier than I said I would be home) and it was super quiet, I was thinking “Awww Im kinda sad the kids are already asleep!” Not even realizing it was suspicious that my husband and mom were nowhere to be found even though her car was out front. I shrugged it off and walked to my bedroom to find my mom and my husband naked, in bed, asleep with each other. My heart literally shattered and I scrambled for a second to find an excuse for them, but obviously there was none.. I immediately woke the kids up who seemed super drowsy, come to find out he gave them Benadryl to put them to sleep early so he could spend time with my mom alone. My oldest daughter kept mentioning that daddy gave them medicine even though they weren’t sick and even pointed out the package for me. 😔 anyways, i got the kids packed up and we all have been staying in our family cabin. I can’t believe this. I don’t even know the man I married. My sister gave me some details and apparently my mom told her they’ve been having an affair on and off for years even before my oldest was born. At one point she got pregnant (I was 22, my mom was 43) but miscarried the baby at 14 weeks right before he was going to leave me for my own mom, but then him and I got pregnant shortly after the miscarriage and he “chose” me. But the worst news is that she’s pregnant, again. At the same exact time as me. (She’s now 49 😭) Our due dates are literally 9 days apart 😭😭🤮Apparently my mom wants to marry him. Not sure if my soon to be ex husband has tried to contact me because I blocked him completely but he has been in contact with my sister about seeing the kids soon as I don’t want to keep them from their father. Im taking some time alone and then we will go through the divorce/custody process so that I can be done with this fake marriage. Being pregnant and dealing with morning sickness makes everything feel 10x worse 😭 wish me luck everyone I’m done with my mom and my husband other than to be respectful for the kids. ✌️