Breakup to better Life

I'm Harry 34 divorced 2 children 8 and 6 now living with ex wife Gale 31, we divorced 2 years ago and she has since married her partner Marie 37. I get to see the children regularly and have them half the holidays. I didn't contest the divorce and we settled on friendly terms. She got the house and I pay only for the children till they leave home to start their own life or 21 which ever comes first. I moved in with my sister Emma 37 single doctor and mother Caroline 56 widow. I work at home mostly and Emma works in her own practice. About 6 months after the divorce I started having sex with Caroline and then when she was away visiting her sister Ruth 62 for two weeks. I started I walked in on Emma showering and playing with herself. I joined her in the shower and we have been sleep together ever since and she is pregnant to me. Caroline regularly joins us and recently Gale asked me if I would be interested in getting Marie pregnant, Marie wants a child and Gale doesn't have any brothers and I'm the next in line to make a family connection between the children. I said I would donate sperm and later Gale said Marie wanted direct insertion and I said I would think about it. Gale said She would be with us and when I asked Would be a threesome expecting a load No way. She answered I can't see why not, but you do Marie first and so we did it a couple of times and Marie got pregnant and so did Gale. Caroline has just bought the house next door to her place, It's a large house small yard and she asked Gale and Marie to move in there with the children and she is having the fence removed between the properties. They have agreed and they will still have their own private place and babysitters next door. Marie has said She might want another child later.