Crossword Genius

At home hesitation about a member of the family may be sensible (2,6)

Ross

I believe the answer is:

in reason

I'm a little stuck... Click here to teach me more about this clue!

'a member of the family may be sensible' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'at home hesitation about' is the wordplay.
I cannot really see how this works, but
'at' could be 'on' (location) and 'on' is present in the answer.
'home' could be 'in' ('he's home' can mean 'he's in') and 'in' is found in the answer.
'about' could be 'rea' (I've seen this in other clues) and 'rea' is found within the answer.
A single letter 's' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for in reason that I've seen is " as far as practicable".)

I've seen this clue in The Telegraph.
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