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.
BROCK LESNARS HALFBROTHER
The plural of grandpa is grandpas.
Kane is Undertakers storyline half-brother.
He's Mike Kroegers halfbrother so, no.
grandmas
click very fast and dont listen to grandpas talk.it is hard
He\she is your 2nd cousin.
200007
Rustbucket
Shcmitsziegertonstien!
that would be your grand uncle
great great uncle