My 54 year old sister just informed me in a three page letter that she is living her life with my 29 year old sons dad. And ask if he hated her she would live with that . She is not answering her phone to any calls that I may make to her. And I left on her answer machine that my son was not taught to hate. He could have answered for himself , but the letter was address to me and I did not read the whole letter. My son was in a car accident with his sister and she was in the car at 3:00 a.m in the morning waving at me from the car. Hugging and kissing me on the cheek at my youngest sons wedding all along sleeping and living with my oldest son's dad. I mention to her that I wanted to get married on my 50th birthday, her comment was she wish she had done the same . My birthday is 4 days away and I do not have anyone in my life, but Jesus and she does this. Why?

Sounds pretty complicated. Is your 29 year old "sons dad" your ex husband? Regardless, it's called free will. She can do what she pleases as long as she is not being coerced. She is 54 living the life she chooses. Life's not fair, it rains on the good and the evil!

I know a man who ran off with his sons wife. It can be low moral values and sleeping with anyone that is available.

It may be gross misunderstanding of relationships and confussion of friendship and lovers

Assuming that you are not currently married to your son's father, I'm not sure I see the problem. Yes, it would have been nice if she told you beforehand that she was attracted to him, but they are both free agents (assuming this) so they are free to have a relationship. It may be no reflection on you at all. You might want to simply wish them happiness.

As to your son being in a car accident and the rest, I'm confused what that has to do with anything.