Your uncle is either the brother of your mother or father, or the husband of a sister of your mother or father.
If your uncle is a brother of your mother, then his sister's son is you (if you are a boy) or your brother, or your first cousin (if the son is the son of another sister than your mother).
If the uncle is a brother of your father, then his sister is your father's sister (your aunt) and her son is your first cousin.
If the uncle is husband of the sister of your mother or your father, then the sister's son is not related to you.
Your uncle's son would be your cousin. Your parents' brothers and sisters are your aunts and uncles. All of their kids, regardless of gender, are your cousins.
I think the relationship is first cousin once removed but we have no relationship name (nephew, cousin etc) for that person
cousin
He would call your aunt his great aunt. In informal situations, great aunts are sometimes called, simply aunt.
He would call your aunt his great aunt. In informal situations, great aunts are sometimes called, simply aunt.
A nephew is a cousin to his aunt's son.
In-laws are not related.
Your son and your aunt's son are first cousins once removed to each other.
great nephew
They would be 3rd cousins.Grandma-GrandpaMom-Auntyou-cousinson-3nd cousinthe diagram is supposed to show that if your cousin has a baby it would be your son's 3rd cousin because your cousin would be his 2nd cousin.
You would call the son of a lord, John, son of Lord So-and-So
Assuming that "his aunts" have reached the age of majority and that "your son" has a passport with the VISAs required by Morocco for citizens of "your son's" country, there should be no issue.
Christians would call Jesus the son of the Highest, because Christians believe that Jesus was the son of God.
Your aunt's daughter is your first cousin, and her son is your first cousin, once removed.
He would call her his aunt.