Like a family with two boys (5)
I believe the answer is:
royal
'like a family' is the definition.
I can't judge whether this defines the answer.
'with two boys' is the wordplay.
'two boys' can mean two substitutions for 'boy'.
'with' means one lot of letters go next to another.
'boy' becomes 'roy' ().
'boy' becomes 'al'.
'roy' next to 'al' is 'ROYAL'.
Can you help me to learn more?
(Other definitions for royal that I've seen before include "Relating to kings/queens" , "Member of ruling family" , "like The Grand Old Duke of York, perhaps" , "Suitable for king or queen" , "Queen Mary, for example" .)