Question

why was the family surprised to see the grandfather alive (the dear departed)

Answer 1

the family surprised to see the grandfather alive  As they have already assumed that grandfather has died and they were all fighting for the proccessions of grandfather.

Answer 2

Abel makes a very dramatic announcement in the end that he is going to marry Mrs. Shorrocks who keeps the "Ring-O-Bells". Moreover he is going to take away his things and leave nothing for his daughter.