Grandparent

Grandparents are the parents of a person`s father or mother – paternal or maternal. Every sexually-reproducing creature who is not a genetic chimera has a maximum of four genetic grandparents, eight genetic great-grandparents, sixteen genetic great-great-grandparents, etc., though the numbers can be lower due to pedigree collapse. In the histor....
Found on http://en.wikipedia.org/wiki/Grandparent

grandparent

(from the article `consanguinity`) ...of this principle is most easily demonstrated by example. If a brother and sister married, their offspring would have one chance in four of ...
Found on http://www.britannica.com/eb/a-z/g/59

grandparent

[n] - a parent of your father or mother
Found on http://www.webdictionary.co.uk/definition.php?query=grandparent
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