Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,184
Everybody has their own expiration dates and needs to be independently active. However if anybody in the HHA has elite status, nobody's Avios will expire.
Of course, a small one-way redemption for one person will take Avios pro rata from everybody's account, keeping everybody active...