Debts and Credit

Does a signed promissory note need to be notarized to be an official document? My son lent a friend money and when my son tried to collect the unpaid debt, he was told since the borrower's signature wasn't notarized it is not an official document and he can't take the promissory note to court to sue for his money. Is that true?

If I owe money and the person dies, do I still owe money?

I have a court ordered judgement on a loan for money that my x-husband borrowed from me when we were married. He wants to sell our jointly owned business and after paying off what the business owes, there will not be enough money to pay me in full. Because the court ordered this money be paid back to me, does he still owe the remaining money after the business is sold? Can I put a lien on the business and hold up the sale of the business? Could I use the lien to force him to sign papers that he will guarantee to pay me the remaining amount on the loan.

Last year i lent my daughter a lot of money she made two payment and then would not answer her phone or door to me can i take her to court and get my money back, at the time of this we both lived in North Carolina, this past Jan she moved to Florida.

Is it legal for a debt collector to not notify you of a debt from 7 years ago?