+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
PA ( your son) will need to fill out form imm 5604. The requirement for age over 18 to fill imm5604 is for dependents. If PA is a minor, form imm5604 is still needed.

Should have information of father and mother (regardless of immigration status) . (and siblings if any)
We both parents are here and living together