Not quite a tiny home and too small to really be considered a guest house, granny pods and mother-in-law suites have carved out their own categories. House Method describes a granny pod as an individual and independent residential unit attached to or on the same property as a family home. All water, sewage, and electricity are shared with the main house. It will consist of a small kitchenette, a bathroom, a bedroom, and usually a living space, which can sometimes also be the bedroom in studio-esque style. A mother-in-law suite will have all of these same features as well, but the real difference lies in who the rooms are meant for.
Just as their names entail, a granny pod will have amenities suited for the elderly that mother-in-law suites may not have. People often build these pods for their older family members to avoid nursing homes and offer more personalized care that is closer to home. Granny pods will feature resources such as railings, ramps, lifts, and cushioned flooring. Your mother-in-law suite will be a much more standard guest area that is not necessarily targeted at an older demographic.