A family related by blood (4)
I believe the answer is:
akin
'related by blood' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for akin that I've seen before include "Related or similiar" , "Similar in quality" , "Close" , "Having similar characteristics" , "Related or similar - as a relative?" .)