nephew
Great Uncle.
No relation
None. There is no relation through "my friend"
If your half-brother has a full sister, she is your half sister. If your half brother has a half sister, she may be your full sister, or she may not be related to you at all.
Yes.
Real sister, half sister, or step sister
They have the same mother and different fathers.
Your fathers brothers are your uncles. You are their nephew, or niece.
Your half-brother's full brother would also be your half-brother.Your half-brother's half-brother (assuming he isn't your full brother) is probably what we officially call "no relation," though he might potentially be a stepbrother.
Your half-brother's daughter is your niece. Your niece and your son are first cousins to each other.
Sid is Tom Sawyer's half brother because they share one parent in common - their mother. They have different fathers, which makes them half siblings.
the relation is that person is either your half brother or half sister. 1/2 brother or sisiter