Although the grandparents relationship is not socially acceptable in most communities, as long as the parent resulting form that union did not inherit a genetic disease that could be passed along, the effects on the grandson are likely to be minimal to nonexistent
They would be your grandparents brother of sister
A grand uncle or great uncle is the brother of one of your grandparents.
If they are biological brothers/sisters then they either have the same mother OR fatheror have both the same mother AND father.If they are brother and sister by law then they're brother-in-law or sister-in-law brother-in-law if that person is male and is the brother of the person your biological brother or sister marriedsister-in-law if that person is female and is the sister of the person your biological brother or sister marriedIf the biological brother has a romantic relationship with the biological sister then their relationship will be called incest.
its your sister
The daughter of a person's brother or sister is that person's Niece The son of a person's brother or sister is that person's nephew
They would be 3rd cousins.
A great aunt or uncle is a sibling (brother or sister) of one of your grandparents.
A sibling is any person who is either brother or sister to that person. Half siblings and step-siblings are the same, are the same, but half sibling is a half-brother or half sister, and a step sibling is a step brother or step sister. No matter what your age, any brother or sister is considered a sibling.
siblings are a person's brother or sister
You are not related to all of your brother-in-law's family, but you are related to some of them. You are related to your brother-in-law. You are related to his wife, your sister. If he and your sister have children, you are related to them - they would be your nieces and nephews. But you are not related to your brother-in-law's siblings, cousins, parents, aunts, uncles, grandparents, etc.
First cousins are relatives who have the same grandparent. Second cousins are relatives who have the same great grandparent Third cousins are relatives who share the same great great grandparent. If you and a relative have great grandparents who were brother and sister, then you share a great great grandparent, and are third cousins.
If two people are brother and sister and the sister has a son, then: her brother is her son's uncle, and her son is her brother's nephew.