Here's a simple tool I made that allows you to see if two bitcoin addresses are connected.

http://learnmeabitcoin.com/tools/path/

Here's an example: http://learnmeabitcoin.com/tools/path/?start=1AYtnRppWM7tWQaVLpm7TvcHKrjKxgCRvX&end=1KLahQtqDNAXvrjNyfvgSBtAhwco5ZxLp4