For example, the publicized "Abraham Lincoln, 16th President of the USA is George Washington, 1st President of the USA's 10th cousin!" and many other publicized links.
The tree above relies on the following connections:
George Washington, 1st President of the USA→Capt. Augustine "Gus" Washington, Sr. his father
→Mildred Warner his mother
→Elizabeth Reade her mother
→Jane Berkeley her mother
→Edward Berkeley, Lieutenant her father
→Maurice Berkeley his father
→John Berkeley, Jr. his father
→Frances Poyntz his mother
→Joan de Berkeley her mother
→Muriel Berkeley her sister→Catherine Throckmorton her daughter
→William Norwood her son
→Richard Norwood his son
→John Norwood, Sr. his son
→Susannah Howard his daughter
→Elizabeth Shipley her daughter
→Robert Shipley, Jr. her son
→Lucinda Shipley his daughter
→Nancy Lincoln her daughter
→Abraham Lincoln, 16th President of the USA her son
Just focusing on the branch with Washington, fill in the birthdates listed:
George Washington, 1st President of the USA (1732)→Capt. Augustine "Gus" Washington, Sr. (1694) his father
→Mildred Warner (1671) his mother
→Elizabeth Reade (1625) her mother
→Jane Berkeley (1595) her mother
→Edward Berkeley, Lieutenant (1571) her father
→Maurice Berkeley (1546) his father
→John Berkeley, Jr. (1573) his father
→Frances Poyntz (1550) his mother
→Joan de Berkeley (1508) her mother
Obviously, something is very wrong here. I'd pose this directly to the manager of the tree, except this affects *many* of the trees used in articles advertising the site.
The Dowling family genealogy (http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=dowfam3&id=IG350600) has many of the same names, but the dates are quite different.
George Washington, 1st President of the USA (1732→1731/1732)→Capt. Augustine "Gus" Washington, Sr. (1694→1693/1694) his father
→Mildred Warner (1671→1670/1671) his mother
→Elizabeth Reade (1625→1625) her mother
→Jane Berkeley (1595→1593) her mother
→Edward Berkeley, Lieutenant (1571→1571) her father
→Maurice Berkeley (1546→1547) his father
→John Berkeley, Jr. (1573→1518) his father
→Frances Poyntz (1550→1495) his mother
→Joan de Berkeley (1508)→Elizabeth Huddesfield (1480)→ her mother
While I cannot vouch for the accuracy of this particular tree, this or nearly any other solution to the above inconsistency breaks the relation of Washington to Lincoln, as well as other relations listed in http://www.geni.com/blog/look-whos-related-george-washington-and-all-the-presidents-325451.html such as
Washington to Monroe
Washington to Van Buren
Washington to PIerce
Washington to Arthur
You get the idea.