Adam was the firs person on the planet...
Your grandfathers' sisters' grandchildren are your second cousins.
Your grandmother's sister's grandchildren are your second cousins.
Children of sisters are first cousins. Grandchildren of sisters are second cousins. Great grandshildren of sisters are third cousins.
You are a great-aunt.
No, they`d be the second sisters great nieces and nephews
You would be their great Aunt.
Your grandchildren and your nephew are related t each other as first cousins, once removed.
Yes, second cousins are always related. Being second cousins means that you are the grandchildren of two people who were siblings (brothers or sisters). Marriage and divorce has nothing to do with it.
If your friend's great grandmother was the sister of your great grandfather, then you are third cousins. The children of siblings (brothers and sisters) are first cousins. The grandchildren of siblings are second cousins. The great grandchildren of siblings are third cousins.
Jesse Owens had six brothers and sisters
Your grandmother's sister is your great aunt. Your great aunt's daughter is your first cousin, once removed.
Your grandchildren and your great niece are second cousins to each other.