It seems pretty clear many of us have looked at this profile, seen it needs splitting into Stafford and Belvoir, and then put it off. It will be a bit complex but also we will all be thinking there might also be disagreements. So let's try to draft a plan:
1. Different proposed splits we can use:
a. Keats-Rohan's proposals in Domesday People pp.380-381.
b. Henry Project: http://home.earthlink.net/~henryproject/hproject/prov/godeh000.htm
c. Peter Stewart: http://www-personal.umich.edu/~bobwolfe/gentxt/Origin_and_early_generations_of_the_Tosny_family.pdf
a. Keats-Rohan divided the father Roger [[Toeni-21]]: Roger the Spaniard is the father of Robert of Belvoir; Roger of Conches (actually another son of Roger the Spaniard) is father of Robert of Stafford.
b. Henry project makes Robert of Stafford the son of a single Roger. The webpage does not discuss Robert of Belvoir.
c. Peter Stewart also does not split Roger the father. He makes Robert of Stafford his son (like Henry project), but Robert of Belvoir becomes a nephew whose father's name is not known: "speculative placement of three children [Bertha who m. Laval, Robert of Belvoir, and Berengar Spina] who are recorded as siblings to each other, but who cannot be readily connected elsewhere".
3. Looking for any core of agreement. All 3 of the above sources see Roger of Stafford as the "main line" Toeny. The problem for all of them is how to explain Robert of Belvoir, and in fact all of them only offer speculations.
4. Proposal for now: start with the main line. Remove everything to do with Belvoir to a new profile for now. Make sense?