Your grandson is the great-nephew of your brother.
She is your third cousin.
The father's son is the uncle of the son of the father's daughter.
your second nephew
Great uncle / Great nephew
Your son's child and your nephew are second cousins.
The relationship of a stepbrother's son to someone would be that of a step-nephew. This is because the stepbrother is not biologically related to the person, but is a relative through marriage. Therefore, the stepbrother's son would be the person's step-nephew, as they are the child of the stepbrother.
your son and your brother's son will be cousins
your grandchild
Your son and your 1st cousin's child are 2nd cousins.
No because that would be your cousin
Great niece
He was an only child, and had no sibling, but did have a wife and son, Penelope and Telemachus.