
n. a person who is in direct line to an ancestor, such as child, grandchild, great-grandchild and on forever. A lineal descendant is distinguished from a "collateral" descendant, which would be from the line of a brother, sister, aunt or uncle.
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http://dictionary.law.com/Default.xhtml?selected=1168

A lineal descendant, in legal usage, refers to a blood relative in the direct line of descent - the children, grandchildren, great-grandchildren, etc. of a person. In a legal procedure sense, lineal descent refers to the acquisition of estate by inheritance from grandparent to parent and parent to child, whereas collateral descent refers to the ac...
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http://en.wikipedia.org/wiki/Lineal_descendant

(n) Lineal descendants are the direct line of relationship flowing downwards from an individual starting with his children, grand children and their children and so on . Unlike collateral descendants it wont include brothers and sisters
Found on
http://www.encyclo.co.uk/local/21213

See: issue
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http://www.nolo.com/dictionary/lineal-descendant-term.html
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