From MyHeritage: Managing Multiple Sets of Parents in the Online Family Tree

Families come in all shapes and sizes. MyHeritage users can now specify up to three sets of parents for any individual in the online family tree: biological, adoptive, and foster. For example, if an individual was adopted and his or her biological parents are known, both relationships can now be accommodated in the family tree in a few simple steps.

You can read a lot more in the MyHeritage Blog at: https://bit.ly/3yOKkGf