The name given to the son of your aunt is first cousin or simply cousin.
A father and son relationship is called a paternal relationship.
In Gujarati, "aunt" is referred to as "મામી" (māmi) for maternal aunts and "ફૂફી" (phūphī) for paternal aunts. These terms are used to distinguish between aunts from the mother's side and the father's side of the family.
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.
great nephew
Your son and your aunt's son are first cousins once removed to each other.
King Solomon was the son of King David and Bathsheba. His paternal grandfather was Jesse and he had two paternal aunts, Zerulah and Abigail. Jesus was a descendant of Solomon's, through his father Joseph.
gomo
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.
Your aunt's daughter is your first cousin, and her son is your first cousin, once removed.
Aunts.