As to the earlier Obadiah Chew, I have seen a history of Blackburn. That book identifies an "Obadiah Chew" whose profession was "plasterer" early in the 19th century. Given the somewhat unusual name, my guess is there is a relationship.
Returning to the Obadiah Chew, deceased in 1914, he was a plumber. My suspicion is that Thomas was his only son. I have reviewed the Lancashire BMD records and have seen the surname Bamber. I may have seen Thomas' death certificate too. These are investigations yet for me to pursue.
Are you,by any chance, directly related to Obadiah Chew or his son,Thomas?