Spouse's stepnibling's spouse.

1. The grandchild of one's parent's stepsibling.
2. The stepgrandchild of one's parent's sibling.
3. The grandchild of one's stepparent's sibling.

1. The grandchild of one's stepsibling.
2. The stepgrandchild of one's sibling.

Sesqui-first cousin’s child.

Sesqui-first cousin’s child.

Sesqui-first cousin’s grandchild.

Sesqui-first cousin’s grandchild.