Yep HK is right, I found the FBI files on Patriarca and it mentioned around 9/24/63 or 9/25/63 Bianco was made into the New England family at some special ceremony at "Roma's" in New York when the books were actually closed.
It seems they made him to try and keep the Gallo Gang in check since Bianco was with them and made and of course to keep the peace.
It didn't mention if he was made into the New England or Colombo family but I would assume since Ray put him up he was under him? What are your thoughts Hairy?
