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→The H-Tree: Ancestor Grid
[[File:Htree trial modified grid Horizontal Left to Right 41.png|thumb|left|600px|H-tree trial(5 generation(31 people shown)(Gramps 4.1.0 Windows 7)]]
The Genealogy program [http://www.ics.uci.edu/~eppstein/gene/UserGuide.html#txgrid Gene] first called this type of chart the '''Ancestor Grid'''. eg: ''A different type of ancestor tree drawing, the "Ancestor Grid", connects generations alternately left-right and up-down, so that ancestors are spread in a grid around their common descendant. The horizontal or vertical style determines which direction is used first. The tree structure of these drawings is less clear than in the "Ancestors" tree but the grid can sometimes fit more names in the given space. Unlike the other tree drawings, when the ancestor grid runs out of room to add more generations it simply cuts the tree off, without adding any ellipses. Below we show a horizontal ancestor grid.'' Gene 4.3 User Guide:4.3. Ancestor trees and grids, Copyright 1995-2000 David and Diana Eppstein. At least as far back as [https://web.archive.org/web/19970502091401/http://www.ics.uci.edu/~eppstein/gene/UserGuide.html#ancestor%20trees 1997]
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