Alice and Frank Longbottom are former Aurors and members of the Order of the Phoenix (canon). They are Neville Longbottom's parents.
They reside in St. Mungo’s Hospital (canon) permanently after having been tortured into insanity by Death Eaters Bellatrix Black and Rabastan (canon) and Rodolphus (canon) Lestrange during the Wizarding War.