Well I didn't get teh family discount for my party of 6 (strictly one of those doesn't live at the same address, but spends more time at my place / overnight etc she might as well).
Only reason I didn't get Family Discount was due to me not bring any proof address on the day I got the APs.
However, I did return the following day with suitable paperwork to cover my partner and I, which after much discussions in French they agreed to the family discount.....however couldn't give it to me in Euros for reasons I'm unsure.
Instead I got 3 months extra on all 6 AP's