Tom was Vito's son, not Michael's brother, but I don't think he'd ever be disloyal to Michael--even if fear were his motivation. Also, he may not have solicited an offer from the "House and Hotels"--they may have come to him without any come-on from Tom.
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.