Hey, Stu,
Ask them their marital status, too and if married:
First marriage? If not, how many, how long?
etc.
A good counsellor should have no problem answering personal questions.

Favorite marital programs, authors, websites? Why?

What percentage of their clients reconcile?

Keep going.

Gardener

"My soul, be satisfied with flowers,
With fruit, with weeds even; but gather them
In the one garden you may call your own."
Cyrano deBergerac