In English there are no masculine or feminine forms. English uses gender specific nouns for male or female.The noun 'son' is a gender specific noun for a male offspring.The gender specific noun for a female offspring is 'daughter'.The common gender noun for a male or female offspring is 'child'.The noun 'offspring' is also a common gender noun.
A nephew is a cousin to his aunt's son.
Your son and your aunt's son are first cousins once removed to each other.
great nephew
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.
to make it easier lets say ' aunts son' so that is your cousin
Your mother's aunt's son is her first cousin and your first cousin, once removed.
First cousins, twice removed. Aunts daughter is your cousin. Aunts daughters daughter is cousin once removed Aunts daughters daughters daughter is cousin twice removed.
Harry's cousin's name is Dudley.
In-laws are not related.
The noun 'son' is a word for a male, a boy or man in relation to either or both of his parents. The noun 'son' is a singular, common, concrete noun, a word for a person.