I never realized so many of us parents were dealing with the same kind of heartaches from our children. How sad

Children can be very cruel, can't they? I figure I'm getting payback for all the years I didn't have a good relationship with my mother, so, now, my 45 year old son is doing the same thing to me.
I had a domineering, verbally abusive mother. She wore my father down into a weak, pathetic man that had no mind of his own. I was 19 when I married the first man that came along just to get out of the house and away from her criticism and nasty comments to me. The "marriage" was a huge mistake and I moved back home. This was another huge mistake because it gave them both the opportunity to criticize me even more. This was a pattern for me that lasted my whole life. I'd get bouts of guilty thoughts that I should try to be a better daughter but every time I called her, she was very curt and disapproving. I lived in another state for many years hoping distance would be the best thing for both of us. My conscience would nag at me all the time. It was hell. I knew what would happen if I contacted her, but I felt guilty if I didn't.
My father died in 1987 (he was only 76) and she was left with a house she couldn't take care of. She was crippled with arthritis. I offered a place to live with me and I told her I'd help her sell the house. She actually agreed. I quit my job and left my family to go help her. I lived 400 miles away at the time. When I got there, we were sitting on the porch and I was asking her what she wanted to do with the house. She looked at me and said, "Are you crazy? This is my home and I'm staying here." I was stunned. The next day, she had a pre-op appointment for a knee replacement and I told her she needed to take all her meds with her so they knew what she was taking. She told me I didn't know what I was talking about (even though I had been in nursing for many years). So, we went to her appointment and the first thing the nurse asked her was if she brought her meds with her. I went out to the waiting room and when she came out and sat down, she looked at me and said, "What the hell's the matter with you?" Everybody in there heard her but I was so embarrassed, I couldn't say anything. When we got back to the house, I packed and left. She was screaming at me and told me to never come back.
A few years went by, and she seemed to "soften" a little. I found out the neighbor woman and her husband next door had been "taking care" of her. These people were notorious for doing this to other lonely women so they could get whatever they had. My husband and I never knew this until we were visiting in town a few years later and my mother announced that she had a "new" family. I was not allowed to be alone with her to talk to her. They were always there. Her neighbor took me aside and told me, "You just have to know how to play the game (with her)."
I wanted to know what my mother's medical condition was so I went to her doctor's office and got the paperwork for her to sign so I could be informed of her medical situations. She refused to sign it and called the neighbors to come over and she told them that she was in danger from me and my husband. She wanted them to call the police to have us removed from her property! They came running over and got her calmed down and didn't call the police. I explained I just wanted to know what was going on with her. My mother looked at me and said, "You're nothing but a whore and a slut. I've only made two mistakes in my life...one was marrying your father and the other was adopting you." David and I left and I never had any contact with her after that. I was 51 by then and decided I'd had enough. She died 3 years later. I almost didn't make the trip to go to the funeral. We were living in TX by then and she was in MI. Her neighbor and "new family" made all the funeral arrangements. My mother always had beautiful clothes but by the time she died she didn't even own a dress to be buried in. When I saw her in the casket, she had on some borrowed ugly dress on that she would have never worn when she was alive.
I found out soon after that the neighbors "inherited" everything my mother had, including the house.
This is a long explanation of why I think my toxic relationship with my son is the way it is is because I'm reaping what I sowed. By neglecting my mother as her daughter is coming back to haunt me.