Told of being of the same family (7)
I believe the answer is:
related
I believe this clue is a double definition.
'told' is the first definition.
(relating is a kind of telling)
'being of the same family' is the second definition.
(I've seen this before)
'of' acts as a link.
(Other definitions for related that I've seen before include "within family" , "of one family" , "Reported" , "Told (a story etc)" , "Having family links" .)