Legal Question in Family Law in Washington

I've never tried that, but I do not believe the civil procedure rules in effect all for it anyway. I think your friend's best bet is to make a motion to be allowed to serve the defendant by publication. You'll need to demonstrate all the steps you've taken to try and personally serve the defendant, and then explain how you are totally unaware of their current address, and thus, you now seek an order to allow service by publication as the most reasonably calculated way to provide notice of the suit.

On a side note, let me say that when clients come to me with this type of scenario, unless there are assets that you know exist, which can be seized in some way upon obtaining a judgment, then you may as well save your money and forget the suit. Getting the judgment is only half the battle� the easy half. The hard part is actually collecting on a judgment where the person has no assets that can be used to satisfy a judgment.