If Dad loves cooking, the Anova Precision Cooker will give him an easy, affordable entry point to the world of sous vide. It's also more affordable than full bath sous-vide machines, and it won't take up as much counter or cabinet space.
This smart LED light bulb is an Editors' Choice winner for its excellent lighting characteristics and its compatibility with a range of popular smart-home control hubs. At $15 a pop, it's also one of the most affordable smart LED bulbs out there.
Icontrol's Piper NV is an all-in-one security device that doubles as a smart-home hub. It houses a night-vision-capable security camera, a host of sensors (temperature, noise, humidity, light...), a speaker, a microphone and a siren. It will also let your dad store saved video clips in the cloud for free.
It's (sadly) not an instant beer machine, and as a home-brewing accessory, it's also not the most cost effective. Still, there's a certain magic to the way the PicoBrew Zymatic lets you dump in a bunch of ingredients to help you along with making beer at home. If Dad likes home brewing and he's been especially good this year, he'll love diving into this thing.