As of January 22, 2022
From FindAGrave - Transfer Guidelines

Memorials are transferred for relatives with these close relationships: child, spouse/partner, sibling, parent, grandchild, great-grandchild, grandparent, great-grandparent, niece/nephew, great-niece/nephew, aunt/uncle, great-aunt/uncle, or first cousin. This would include adoptive, step and in-law versions of these relationships.

As of January 22, 2022
From FindAGrave - Transfer Guidelines

Memorials are transferred for relatives with these close relationships: child, spouse/partner, sibling, parent, grandchild, great-grandchild, grandparent, great-grandparent, niece/nephew, great-niece/nephew, aunt/uncle, great-aunt/uncle, or first cousin. This would include adoptive, step and in-law versions of these relationships.