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Strange condition — one remains if twin daughters and sons leave (7)

Ross

I believe the answer is:

oddness

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'one remains if twin daughters and sons leave' is the definition.
I can't tell whether this definition defines the answer.

'strange condition' is the wordplay.
'strange' becomes 'odd' (I've seen this before).
'condition' becomes 'ness' (I am not sure about this - if you are sure you should believe this answer much more).
'odd'+'ness'='ODDNESS'

Can you help me to learn more?

(Other definitions for oddness that I've seen before include "Eccentricity" , "Peculiar quality" , "Peculiarity characteristic" , "Curious state" , "It isn't even" .)

I've seen this clue in The Times.
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