Family must follow as well understood (4,2)
I believe the answer is:
took in
'understood' is the definition.
('take in' can mean to understand)
'family must follow as well' is the wordplay.
'family' becomes 'kin' (synonyms).
'must follow' means one lot of letters go next to another.
'as well' becomes 'too' (synonyms).
'kin' put after 'too' is 'TOOK IN'.
(Other definitions for took in that I've seen before include "Admitted" , "Duped; accepted" , "having cheated" , "Received into one's home - understood - deceived" .)