It's probably overkill for a residential installation, but Grandstream has a SIP-based Audio/Video Keyfob/Keypad door access system. You could skip wiring up t

It's probably overkill for a residential installation, but Grandstream has a SIP-based Audio/Video Keyfob/Keypad door access system. You could skip wiring up the door release mechanism, and just have it make a video call, and it's designed to be outdoors and weathered. http://www.grandstream.com/products/facility-management/facility-access-systems/product/gds3710 http://www.grandstream.com/products/facility-management/faci... However, with anything like this for a family, unless they share the same enthusiasm for DIY tech projects, frustrations will occur, and you will be the target of that frustration anytime it doesn't work :(