Forgot to post - last summer (2016) family of 5 flew in J starting/ending in Ottawa, Montreal, and Toronto:
YOW/YUL-YYZ AC J
YYZ-ICN (stop) AC J
ICN-PEK CA J
PEK-LHR (stop) CA J
LHR-YUL/YYZ AC J
YUL-YOW AC J
We were all together from YYZ to LHR.
The cost was 150,000 miles (Asia 1) plus $482 (primarily due to J fees at Heathrow). Two fares required $30 booking fee, and others were booked on the Aeroplan site.
nice. how far in advance did you book? all 5 at once?