Information to cite about having common origin (7)
I believe the answer is:
genetic
'having common origin' is the definition.
'information to cite about' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'about' indicates an anagram.
'cite' with letters rearranged gives 'etic'.
'gen'+'etic'='GENETIC'
(Other definitions for genetic that I've seen before include "handed down through the generations" , "Passed down from a previous generation" , "Tending to occur among members of a family usually by heredity" , "coming from a common source" , "origin of something" .)