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What primary sources prove Gilbert de Venables to be the son of Odo II, count of Blois, Champagne and Chartres and Ermengarde, d'Auvergne
Medlands hasn't found any so far:http://fmg.ac/Projects/MedLands/CENTRAL%20FRANCE.htm#EudesIIdied1037B
The main reason appears to be that he is mentioned as younger brother of Stephen, Count of Blois by Sir Peter Leycester in THE FIRST THREE BARONS OF KINDERTON".
Of his ancestry, Sir Peter Leycester wrote:… This Gilbert de Venables who came to England at the time of the Norman Conquest …it is plain from ancient deeds …was younger brother to Stephen, Earl of Blois.
https://venablesancestry.wordpress.com/introduction/the-first-three...
This seems a little flimsy?