Can I hook up a couple of my can lights in parallel with the light on the fan to the wireless switch?I can't find what the load requirements are to the receiver

Snk,
No... first of all I doubt the relay that the remote triggers for the fan lights is rated for any additional load and then there is NEC 110.3(B) which tells us to install and operate equipment according to it's listing and labeling... does the fan and remote allow additional equipment to be connected to it? Probably not.
If we want to as consumers and Saturday scientists we can make anything work... but someday if it blows up, the insurance won't cover it.