half-co-sister-in-law

Spouse's half-sibling's wife.

My half-co-sister-in-law is a good person.

stepdaughter

A daughter of one's spouse by a previous marriage.

My stepdaughter is a good person.

stepson

The son of one's spouse by a previous marriage.

My stepson is a good person.

co-great-great-grandnephew-in-law

Spouse's great-great-grandnibling's husband.

My co-great-great-grandnephew-in-law is a good person.

stepgrandson

1- Stepchild's son.
2- Child's stepson.

My stepgrandson is a good person.

parent-in-law

Spouse's parent.

My parent-in-law is a good person.

co-father-in-law

Child-in-law's father.

My co-father-in-law is a good person.