UPDATED: My Twin Sister Can't Accept That Our Dying Dad Disowned & Wont Forgive Her For What She Did

Backstory: My family used to be really close but that changed in 2003 when my dad (55M) discovered that my mom (54F) was having an affair with John(54M) my dad's childhood best friend (he was basically his brother back then and he was my dad's best man in his wedding with mom). He begged her to stay and work things out but my mom ended up leaving him for John and eventually they got a divorce and my mom ended up marrying John 5 months later.

My twin sister Sarah(27F) was always the stereotypical ''daddy's girl'', dad spoiled her a bit more than the rest of us and she was basically his shadow back then and that's why was really surprising to us that Sarah choose to stay with our mom after the divorce.

Story 1:
UPDATE: My dad disowned my sister and he is dying, how do I convince her to let him go?
Story 2:
I (37M) have a biological child who I've never seen (17F) wanting to make contact which I don't want but my family does. What should I do here?

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