Two men with member of the king's family (5)
I believe the answer is:
royal
'member of the king's family' is the definition.
'royal' can be an answer for 'family' (royal family is a kind of family). I am not sure about the 'member of the king's' bit.
'two men' is the wordplay.
'two men' means two substitutions for 'man'.
'man' becomes 'roy' (I've seen this before).
'man' becomes 'Al' (man's name).
'roy'+'al'='ROYAL'
'with' is the link.
Can you help me to learn more?
(Other definitions for royal that I've seen before include "- blue; - assent" , "Relating to a sovereign" , "Regal, majestic," , "Excellent" , "With kingly status" .)