nephew-by-marriage

Nephew-in-law (only spouse's nephew).

My nephew-by-marriage is a good person.

step-great-grandchild

1- Stepgrandchild's child.
2- Grandchild's stepchild.

My step-great-grandchild is a good person.

step-great-grandparent

1- Stepgrandparent's parent.
2- Grandparent's stepparent.

My step-great-grandparent is a good person.

step-great-granddaughter

1- Stepgrandchild's daughter.
2- Grandchild's stepdaughter.

My step-great-granddaughter is a good person.

step-great-grandfather

1- Stepgrandparent's father.
2- Grandparent's stepfather.

My step-great-grandfather is a good person.

step-great-grandson

1- Stepgrandchild's son.
2- Grandchild's stepson.

My step-great-grandson is a good person.