Adoption usually involves at least 3 people - the person being adopted, that person's mother, that person's father and the person (or people) doing the adopting. This poses the question, what to show in the lineage of the person being adopted - who are the parents? The choice is yours, whether to show the biological parents or the adopting parents. Either is a valid choice. DNA follows the biological line and adoption shows more about social connections. Using XY Family Tree you can show all the adoption factors. "Person ADOPTED" can have "Father ADOPTING" and "Mother ADOPTING" (they might be married but this is not a requirement) and be associated with "Father RELEASING" and "Mother RELEASING".
Or you can do it the other way round with "Person ADOPTED" being the child of "Father RELEASING" and "Mother RELEASING" and be associated with "Father ADOPTING" and "Mother ADOPTING".
You can also create association between adopting and releasing parents directly.
For each association you can add notes to both sides.
The same principles apply with egg donors.
Although individuals can only have two parents there is no limit to the number of associations that can be shown.
As with same sex marriages it's possible for adopting parents to be same sex.
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