You would be his uncle and he would be your nephew.
Your younger brother's wife's sister's daughter would be your son's cousin.
He is your nephew And you are his Aunt
Step-brothers
the son would be the nephew
Great uncle / Great nephew
No because that would be your cousin
Daniel has three younger brothers so that makes him the eldest
The relationship between them is similar to father and son.
Your grandson is the great-nephew of your brother.
Youre his son.
Yes, she did. She had the relationship of a mother that a mother has with her son. As most mothers do.
He is your Grandfather, and is your son's Great-Grandfather.