My mother-in-law's basement has 7 lights. 1 connected to the switch, the rest are on pull strings. Most of these lights are connected to the circuit directly above them i.e. they are on about 5 different circuits.

Whats my easiest way to wire these so that I can turn them all on with 1 switch? I've looked into wireless sockets/switch products, they look unreliable, and the basement is fairly large, so I think I would run into range as well as line-of-sight issues.

I suspect that I'll need to disconnect the lights from their current circuits and make a completely new circuit, but I thought I'd fish for another method if there is one.