Tatars and Kaukausian Bulgars and slavic Bulgarians can be treated as brothers for they have the same parental ethnic group - bolgars from Edil.
But Tatars ethnic group cannot be brother to bolgars (therefore be the same tribe) for Tatars were fused from mixture of Bolgars, Kypshaks and probably some Finno-Ugrics. And they were fused by Tartars of Golden Horde. So you cannot be brother to your father (if you were not born by his mother, idea that stinks terribly).
Accepting Bolgars is rejecting Will of your ancestors which had reasons to be join into one whole nation - Tatars. _________________ Не судите по тому, что видите -- судите то что видите.