how could I ask the family court to consolidate my motion to set aside
based upon duress from extortion with my civil suit for fraud against
same showing family court lacks subject jurisdiction over extortion
and lacks remedies against one extortionist-an attorney. family court
ruled i could not depose them and its hard to demonstrate duress
without proving the cause. case law?

I assume that you have reviewed case law on duress and found that the
hurdle is set very, very high.

You don't indicate the state that you're in, but the typical family
court has jurisdiction over all related matters.  If your complaint is
with an order signed by the family court, or more specifically the
gaining of stipulations as conditions precendent to the entry of the
order, the family court is probably the ONLY court with jurisdiction.

I am in California. Dale v Dale and other case law have involved
independent torts involving former spouses. Here, the issue is subject
jurisdiction and remedy jurisdiction. Could I file a separate suit in
civil court for the extortion naming the co-conspirators and avoid res
judicata or collateral estoppel if family court can rule only on what
I was forced to sign and duress but cannot try or rule on a felony for
which there exist civll remedies? Example: my ex claims that he can
get family court to award his civil suit fees should I lose because
his intitial fraud fourteen years ago is related to his current
felonious behavior I brought to family court based upon Askew v Askew.
Does this clarify?