Hello Opa Ron, well - welcome in September to this nice spot... You need a Passport to get back into the States and you need a letter of "permission" from the PARENTS to take the grandkids across the border.
Our favorite CG is in Fort Langley (Fort Camping).
We just live 10 miles away from there and go with our grandchild once or twice... Lots of trails for your pet, firepit and lots of space... You do not feel and hear the next RV....it's clean and a pool, store, propane etc is there...
Have a safe trip and enjoy your stay here in the Vancouver area.
TW (also an Opa)
PS: if you need more questions answered, just give me a message
It's a gated RV Park, so - very safe