stepchild

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

My stepchild is a good person.

stepparent

The person who is married to someone's parent but who is not their parent.

My stepparent is a good person.

stepnibling-in-law

1- Stepnibling's spouse.
2- Spouse's stepnibling.

My stepnibling-in-law is a good person.

son-in-law

Child's husband.

My son-in-law is a good person.

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stepgrandchild

1- Stepchild's child.
2- Child's stepchild.

My stepgrandchild is a good person.

granddaughter-in-law

Grandchild's wife.

My granddaughter-in-law is a good person.

stepgrandpibling

1- Stepgrandparent's sibling.
2- Grandparent's stepsibling.

My stepgrandpibling is a good person.