How many original band members are left and is his Grandfather still alive Michael Buble?

Michael Bublé is a solo artist, not a band. Therefore, there are no "original band members" to speak of.

It's also important to note that while we can find information about Michael Bublé's family, we don't have information about his grandfather's current health or status. This is private information and it would be disrespectful to speculate on it.