<human>: Can you summarize the given text in a few sentences?

So a bit of background
I myself am adopted and have a decent relationship with my bio family and my adopted family. When I was younger, I struggled with being adopted and "unwanted" so I went to a support group for adoptees. Here I met Jenny, who turns out is my 2nd cousin who was adopted out of my adopted family. 

This might get a little tricky so bear with me. My 2nd cousin Jenny was adopted out of my adopted family as the result of an unwanted pregnancy when the mother was 19. When I met Jenny and realized we were related, we talked extensively about being adopted and how hard it can be. It turns out she has contacted her bio mom (we can call her Sarah), wants nothing to do with her and said never contact her again. 

Jenny does not know her bio dad and Sarah refuses to tell her, or speak to her. Jenny and I worked together to dig up some information about her dad to no avail. 

Now here is the thing. I know how hard it is to be adopted and feel lost because you don't know where you come from. I tried to connect Sarah and Jenny but Sarah has told me that she wants nothing to do with Jenny and it's none of my business. Sarah has 2 sons from her marriage, 16 and 23. I think they have a right to know about their sister and decide for themselves if they want a relationship with her. When I met my bio family I found out I have a brother which has been amazing. I want them to (hopefully) have that experience or at least the chance to have it. It would likely help resolve some psychological issues that result from being adopted. 

I have been thinking about this for almost 5 years now. The sons are old enough now that I think they can understand why their mother gave up a child at 19 years old. I don't think they would hold it against her. I don't care if anyone gets angry at me because I am not at all close with any of them.
<bot>: moms cousin gave up a baby for adoption 32 years ago. She wants nothing to do with her. But I think her sons have a right to know they have a sister.