I would suggest Caller ID. That way, next time they call you - you have THEIR number and THEIR name. Unless its private, in that case - let the answering machine get it. And if its someone special, like family, or the lottery man telling you you just won a million bucks - they will leave a message. If they dont, dont worry about it.

Or, you can get your phone number changed. Thats drastic, but sometimes thats the only other alternative.

Hope you and your family get everything straightened out so you're all happy again!