[stevepaa]

I would not pay off all the mortgages, they need the deduction.
Set up generation skipping trust funds for the oldest members of the family.
Set up college trust funds for the youngest.
Give money for house down payments for all the rest.

Take them all on family vacations once a year to great spots of my choosing. They can come if they want all expenses paid, otherwise stay home.

Never work for someone else ever again.