Hey @taylorshort. We do indeed work in Mexico and are supported in Mexico for our Doorbells and Cameras. You can see what devices are available in Mexico here. For indoors, I recommend a Stick Up Cam Wired so your parents do not have to worry about charging the battery for that device, and then a Ring Viedo Doorbell 3, as it is our newer battery operated Doorbell and easy to manage. Feel free to get them a spare battery so they can always have a fresh battery to swap out with the Doorbell 3’s battery gets low. 
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