You would be their great-granduncle or great grand aunt, and they are your great-great nieces or great-great nephews.
a relationship between brothers should be sacred and good....
The brothers of your spouse are your brothers-in-law. Also, the husbands of your sisters are your brothers-in-law.
they were brothers
They are not biological brothers, but they are best friends and do have a brotherly relationship.
they are brothers!
Second cousins.
They were brothers.
yes
step brothers
Your brothers great granddaughter is your great great niece.
The Wright brothers had their share of squabbles, like siblings everywhere.
They were brothers