I used to deal with these issues alot, living in a high retirement area. I would suggest to the son that he meet with someone to determine what the next best step to deal with Dad might be. If dad is no longer competent to handle his funds, son has to face the hard decision of taking controll for his dad. This can not be done effectively wihtout legal assistance. A third party often makes it easier on both dad and son as well as they can be a bit more dispasionate about the issues. When parents go from parent to dependant, it's difficult for the entire family.
If he wants a quick solution to the problem on a temporary basis, he could consider opening another account to handle dads affiars out of, leaving just a small amount of money in joint ownership. He is a signer and has the right to do this with funds from the account, but should do so cautiously. It's a short term fix until he can get dad and his new money draining friend under controll.
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Dawn Coursey VP/CRA Queen
CRA Rating is in...Oh who cares...I'm home with the baby.