And here is the will of a Rowland Bentall, gent, late servant to the Lord Bishop of Gloucester, written 20 Nov 1592 (proved at Gloucestershire):
https://www.ancestry.co.uk/interacti...=successSource
I think this is another nuncupative one. Mentions his kinsman Henry Fowler and his two "bretherne" Maurice Bentall and John Bentall.
So if Richard Bentall of Bristol was a brother of George and Francis Bentall, it looks as though they also had brothers Rowland, Maurice, and John.