Using DVC discount to book for someone else?

[rnorwo1]

Hi All,
I'm a DVC member, and I'm booking a trip for my MIL and SIL to go on the Switzerland/Italy trip. Can I get the discount for them, or would I need to be on the trip with them to get it? If I can't use it, I've looked around for other discounts and just see various travel agencies that give you a few hundred ($300-450) off; is that the best discount I'd be looking at?
TIA!