I don't have any suggestions - but feel your pain and that of your family member. My own family members (here from Germany) were scheduled to depart PHL today to head to the Grand Canyon on a trip they planned for a year. Train tickets, accommodations at the Canyon...lots of special stuff planned. AA cancelled their outbound flight last night and we spent hours trying to find ANY alternative...best AA could do was get them on a flight Tuesday, too late to do a lot of what they'd planned and no chance to shift reservations (everything sold out). They made the crushing decision to cancel the entire thing and were on the phone with travel vendors all morning hoping to secure refunds.
AA is a mess right now in PHL...and not just because of the weather. It only makes the current challenges far worse.