Did the Potters have more than one Secret Keeper?

[Elizabeth Snape]

No: HPFGUIDX 169990

This evening I've read a couple of messages stating that Sirius was 
actually the Potters' secret keeper at some point.

But was he? 

I don't believe so.  IMO someone (Snape of course!) warned Dumbledore 
that there was going to be an imminent attack on the Potters.  DD 
offered to be their SK and James refused, preferring his best friend 
Sirius. Sirius then came up with the 'clever' plan to have Peter be 
the SK while letting everyone assume that he [Sirius] was the SK.

Do you suppose it's even possible to change SKs once the charm has 
taken effect?

Now about the house at Godric's Hollow -- from how Flitwick explained 
it, the charm was actually on the Potters, not the house.  So the 
ruins would have been visible to all and Harry shouldn't have any 
trouble finding them.  

Snape's Witch