The relationship term is usually hyphenated "great-grandchildren" (grandchildren's kids).
Step-great-grandchildren.
Since "grandchildren" is already plural, the spelling would have to be the possessive form, which is grandchildren's (e.g. she saved all of her grandchildren's school photos).
nietosuse nietos for masculine, nietas for feminine, nietos for mixed
Yes, Jimmy Swaggart does have grandchildren and great grandchildren. As of May 2014, he has 3 grandchildren and 6 great grandchildren.
The common ancestor is your parents. Your children and your sister's children are first cousins. Your grandchildren and your sister's grandchildren are second cousins. Your great-grandchildren and your sister's great-grandchildren are third cousins.
They're step-grandchildren.
The possessive form of the plural noun "grandchildren" is "grandchildren's".
HE HAS 5 GRANDCHILDREN
HE HAS 5 GRANDCHILDREN
Queen Elizabeth has 8 grandchildren and 5 great-grandchildren.
Reba has step- grandchildren
He has five grandchildren.