Not only do they not have resonance points, they don't have the ability to cast spells or the ability to take the Trick Magic Item skill feat, so no x 3.
While the description for familiars says nothing of them having resonance points, it also doesn't say that they don't have resonance points either.
If I were the GM I'd base it off the wand itself. Familiars roll skills at their master's level -2. I'd say that if the master had the right skill for the right wand they could pull it off (a familiar of a druid with nature could use a nature based spell, a wizard's familiar with Arcana, but not an Alchemist with Alchemical Familiar [sorry Glorp!]).
I'd probably also require that they familiar have the "Understands and Speaks one language you know" option to invoke the command word.
Makes the game more interested, but expect the occasionally dead familiar when it gets targeted by enemy casters and ranged weapon users.