Remote PC Management

Dear Fellow PC Friends. Can anyone give me a suggestion of a in-expensive or free way I can remote into a family members computer to help him instead of having to drive over to his house? He uses a router for 2 pc’s in his house through comcast. and I use 2pc’s with a router through DSL. Remote desktop dosn’t work. Of course our pc’s on the home network have the 192.168.x.x type of addresses. Anyway looking for something simple and reliable. Thank You for your expertise! Have a great day!!

JD