This Family Hearts Thing is a general version of a Valentine's Day wall-hanging that I had designed and posted for a smaller family. It can be assembled for families with as many as 6 children, with up to 3 grandchildren per son or daughter.
I used two colors when printing the examples (red for the boys, and pink for the gals.)
The Parents comprise two pieces ("Parent...Left", and "Parent...Right") which are placed together in the Parent Cradle. This grouping forms the keyhole hanger and the base on which the Children and Grandchildren are placed. The two parent pieces have triangular cutouts that correctly locate their children's hearts.
Each Child and Grandchild heart also sits in its own cradle. (or not. The design allows you to choose. I used cradles in the examples to provide a color contrast when placing like-colored hearts together.)
The Child and Grandchild hearts have triangular guide pins that help locate them on their host heart. This guide pin extends through the cutout in the cradle (if used), and into the host heart's cutout.
I assembled the pieces using CA glue.
3D Solutech PLA
Real Red and Real Pink