https://www.wikitree.com/wiki/Webb-113
Debunking
The story of Sir Alexander Webb II and his four immigrant sons is similar to the genealogical myths adopted by other surnames in America which say that all the great branches of the surname in America descend from the immigrant sons of a single common noble ancestor. (See, for example, The Legend of the Ashley Brothers.) The story of Sir Alexander Webb II and his four immigrant sons has the further advantage of making the Webbs of America related to William Shakespeare. Unfortunately, virtually nothing about the story is based on fact.
Debunking of Sir Alexander Webb II's Parentage
Since Alexander Webb and his wife Margaret (Arden) Webb were related to William Shakespeare, their lives have been researched by a multitude of Shakespeare experts. Contrary to many of the modern online family genealogies, Alexander Webb (the putative father) was not a knight, was never called "Sir" and was not even a "gentleman." Both his will and other records related to his life show that he was a humble "husbandman."[7] More critically, the evidence is fairly clear that he did not have a son named Alexander. Alexander (the putative father) left a 1573 will, which included bequests to his six children: Robert, Edward, Anne, Elizabeth, Mary and Sara.[8] The failure of the will to mention a son named Alexander is strong evidence that he did not have one. None of the profiles of Alexander (the putative father) in articles about Shakespeare's relatives mention a son named Alexander. The only record that could be read to mean that Alexander (the putative father) had a son named Alexander is a receipt by Agnes Arden of Wilmcote, widow (the sister of Alexander, the putative father), for 40s from Alexander Webbe for two messuages that she rented to him in 1560. Since the description of the receipt says it is dated 1580 and Alexander (the putative father) died in 1573, that record seems to suggest that he had a son named Alexander.[7] However, based on Alexander's (the putative father's) will and the absence of any other evidence supporting the proposition that Alexander (the putative father) had a son named Alexander, it is more likely that either the date on the description is wrong or the description incorrectly states that Alexander Webb paid the rent, when in fact it was his son Robert.