What did he do during his sleep away camp out? order take out and watch TV?
spend the family funds? withdraw MORE $$ from the account to cover this? run up the credit cards?
I hope that you make getting back your parents $$ they left to you a strong priority....because as someone (marie1960)? said, I also smell a rat. he is up to something and I think that last night was just the tip of the iceberg.
(i'm sorry to say this and i hope I am incorrect)