Maybe grandfather's sound bond with family, never with sons (8)
I believe the answer is:
ticktock
'maybe grandfather's sound' is the definition.
(as in a grandfather clock)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ticktock that I've seen before include "Sound of an old clock" , "Sound of timepiece" , "Sound of a 7 across" .)