Two people who have at least one grandparent in common are first cousins. Your son and your stepbrother's son may be first cousins, or may be unrelated. Even if they are unrelated that can call each other first cousins if they get on well together and want to do that.
Yes, she did. She had the relationship of a mother that a mother has with her son. As most mothers do.
your uncle is your sons great uncle
Step-brothers
The parable of the prodigal son, found in the Bible, does not mention the mother of the prodigal son. The focus of the parable is on the relationship between the father and his two sons.
basiclly there called brothers .-.-.-.-.-.-. basically* for one... and two no, they wouldn't be called brothers. If it was their parents sons then yeah, but if it's the sons of brothers then they'd be cousins. That's practically like saying one brother got married and had a son, then the other did too and had a son as well. The relation of the sons would be cousins.
Cousine
We do not know much about the day-to-day relationship between Noah and his sons at all. The only incident we know of is that after the flood, Noah's son Ham witnessed his father naked and intoxicated, resulting in Noah cursing Ham's son for eternity.
Great uncle / Great nephew
You wold call them your brothers sons. Hope this helps :)
If it was a boy then he would be your sons half brother and if it was a girl she would be your sons half sister.
your cousin
Your granddaughter and your sister's grandson are second cousins.