One From a Barbú Tournament

Playing SF-style Barbú, you have only Fantan left. CHO owes you a double. Family doubles are prohibited. Aces are low. You do not have to call a card you have.

You hold:
S: Q976
H: 109
D: 94A
C: 1042A

What is your base card?

If all three double you, whom do you redouble, if anyone?

Jeff Goldsmith,, Nov. 13, 2002