Me: Sorry I was at my friend's place
Dad: looks at my wrist
Since when have your friends started stamping the wrist before you enter their house?
OR
Since when have your friends started stamping your wrist before you enter their house?
Me: Sorry I was at my friend's place <<<< This needs punctuation. Dad: looks at my wrist <<< punctuation Since when have your friends started stamping the wrist before you enter their house? NO OR Since when have your friends started stamping your wrist before you enter their house?
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Me: Sorry I was at my friend's place<<<< This needs punctuation.
Dad: looks at my wrist <<< punctuation
Since when have your friends started stamping the wrist before you enter their house? NO
OR
Since when have your friends started stamping your wrist before you enter their house? YES
Just to make sure, do you mean this by 'stamping your wrist'? Where I live, children often stamp their wrist this way.
https://www.google.com/search?q=stamp+your+wrist&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjKuJm1