First off you need to contact your bank. They should have records of the transfer, with necissary details to proved it happend. Next you need to approach Andrew and his mum. They were seeking Power of Attorney for Phil, and once they recieve this they can gain access to the funds and refund you. However, I dont know if Phil was able to sign it all over before his turn, which if he didnt, harder for them to gain it I think. Andrew was trying to address refunds via their Paypal account as he did at least have access to that, but I guess that would have dried up.
Hopefully someone with closer links to Phil and family will be along to get things moving for you