Multi-Location Control The Timer can be turned ON or OFF from any of the Vizia +î Remote Switch locations. The default ON time when a remote is pressed to turn the load ON will be the last countdown time chosen. Here is a link that might be useful: Instruction sheet

This mid-stripping of insulation is a fairly common practice. Instead of pigtailing the hot wire to another device, it is midstripped for attachment to the first device and the same hot wire continues on to the second device. All your son has to do is cut the midstripped wire and pigtail that cut wire to both the new 3 way switch and to the other end of the wire it was cut from. The white wire may not even be present at all if the source is not at the switch. To remove the back stab the easiest way is to just cut it. You haven't mentioned a second traveller. Do you see one?

Thanks. I agree and perhaps I should have said UP and DOWN. When our house was built, some three-way switches put the lights ON when the switches matched, Others put the lights ON when the switches were set one UP and one DOWN. My problem is that the three-ways in question used to work in one of these correct ways, and now, they only work when both sets are in the DOWN position None of the other 3 possibilities lights the lamps. I've replaced both switches, and it's still only both sets DOWN that turns the lights on. If I look at a diagram of one simple way the lights MAY have been connected, and assume that the wire from the panel is no longer connected to one of the switches, that could explain what I see. But, I don't know in fact how the wires were actually routed, so there could be a problem with one of the travelers. Doesn't seem easy to fix either way.

Smart switches are wired diferently than 3-ways. It will take some inspection to identify how the switches are currently wired and how the smart switch needs to be connected. In some cases it may be IMPOSSIBLE. Older houses with switch loops may not have the required neutral.