so I can keep in Touch with them and also take a quick peek in on them to make sure they are ok ...no messy wires ...no monthly subscription fees

I've been told by support to use a hard wire connection to improve the audio and video.

I'd say set them up next to each other in the same room and then move to the final destination unless you're hard wiring into an Ethernet jack

Traditional intercom systems require hard wiring which can be a problem for an existing home vs new construction.- allowing linkages to other people's (homes