Let's look for sources on Osmund.
From one first google hit, they have Osmund as the "tree topper."
http://www.ralstongenealogy.com/yorkshr.htm
Also, "fitz Baildon" would mean "son of Baildon," wouldn't it.
How then is he son of Bethel? Are they supposed to be the same name?
there are some notes in the profile for Bethel de Centerville, Duke of Norman Loire
and the one genealogy link given is here:
http://www.mathematical.com/bathel870.html
Identifying his children as "*a Norman of Basset" whose son is
http://www.mathematical.com/centvilleosmund960.html
children:
*Osmond De Centville
born Abt 0960 Of, Ouilly Basset, Normandy
So at the best we need an intervening generation ... if it's a valid pedigree at all. So i'll set that up as the next step.
That helped. Now the question is:
Is Osmund Fitz Gerneber the same as Osmund Fitz Gerneber and do we have evidence to support the children?
this source
http://www.mathematical.com/centvilleosmund960.html
(which is only a rough guide) doesn't follow the line down from Osmund Basset born about 1009 Ouilly Basset, Normandy