third-cousin

3C:
1- Parent's second-cousin's child.
2- Grandparent's first-cousin's grandchild.
3- Great-grandparent's full sibling's great-grandchild.
4- Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and two great-great-grandparents in common.

My third-cousin is a good person.

third cousin

Great-grandparent's sibling's great-grandchild.

My third cousin is a good person.

third-cousin

1- Great-grandpibling's great-grandchild.
2- Living being that has zero parents, zero grandparents, zero great-grandparents and two great-great-grandparents in common with other living beings.

Third-cousin.

cousin-pibling

Parent's first cousin.

My cousin-pibling is a good person.

step-cousin-nibling

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.

My step-cousin-nibling is a good person.

third great-cousin-niece

Third cousin's granddaughter.

My third great-cousin-niece is a good person.

first cousin-in-law

1. The child-in-law of one's parent's sibling.
2. The child of one's parent-in-law's sibling.

My first cousin-in-law is a good person.