Relatives by marriage (2-4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">relatives by marriage</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for in-laws that I've seen before include "Family of your spouse" , "Christmas is when you might bid them welcome" , "Relations by marriage" , "Spouse's relations" , "A person's relatives by marriage" .)