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Walks on south with relatives by marriage (8)

Ross

I believe the answer is:

stepsons

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'walks' is the definition.
Although both the answer and definition are plural nouns, I can't see how they can define each other.

'on south with relatives by marriage' is the wordplay.
'south' becomes 's' (synonyms).
'with' means one lot of letters go next to another.
'relatives by marriage' becomes 'steps' (I can't explain this - if you can you should believe this answer much more).
'on'+'s'='ons'
'ons' after 'steps' is 'STEPSONS'.

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I've seen this clue in The Sydney Morning Herald.
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