Treads on relative (7)

I believe the answer is:

stepson

'relative' is the definition.
(stepson is a kind of relative)

'treads on' is the wordplay.
'treads' becomes 'steps' ('step' can be a synonym of 'tread').
'steps'+'on'='STEPSON'

(Other definitions for stepson that I've seen before include "No pests with relative by marriage" , "No pests about this relation by marriage" , "No pests (anag)" , "Relation, not by blood" , "Child from a spouse's former marriage" .)

I've seen this clue in The Mirror.

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