Concerning WA state

I posted here early today about my ex filing a motion to set aside the default order by the Courts.

I was made aware that I have to file a response to the motion within 10 days but had a big question.

I have been reading over a lot of cases on motions to set aside default and was wondering if it is okay to quote (properly of course) a Circuit Court of Appeals case in a Family Law case...mostly because of the reasons on judgements against re-opening a defaulted order.