There is no word in the English language for a relationship between grandmothers of related grandchildren
It depends on which "half" of your half-brother the nephew is related to. Your half-brother shares your father or mother, but not both. If your half-brother's nephew is related to the same parent you are related to, your half-brother's nephew would also be your nephew. If related to the other parent, he would not be related to you.
It's possible to have a half-brother who is a great guy... but you can't have a great-half-brother. The term "great" is reserved for ancestors or descendants, but not for siblings.
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.
The son of your half-brother's father is not related to you when the father is not your father.
BROTHER AND SISTER. Half brother and sister.
Your half-brother's half-sister could be your full sister, or not related to you at all. For example, say your parents are Joe and Mary and your half-brother's parents are Mary and Steven. Say your half-brother's half-sister is Barbara. If Joe and Mary are Barbara's parents, then she is your full sister and your half-brother's half-sister. If Barbara's parents are Steven and Jane, then Barbara is not related to you (unless there is an adoption).
he is supposed to be his half brother
Yes he was, he was Tupacs half brother.
Your grandfather's half brother is you great uncle. Some would insist on calling him your half-great uncle, but the English language has not had a need to get that specific and complex about such distant relationships.
Half-fourth cousins
yes they are masons brother is mitchell and mileys half brother is trace