You do not need a smart home. You need three smart devices in the right places.
Smart doorbell. See who is at the door remotely. Your parent can check from the couch before answering.
Smart plugs on coffee maker and TV. Passive activity signals. Did the coffee maker turn on at the usual time? Not surveillance — a signal she is moving through her day.
Smart speaker for voice-activated calls and reminders. "Hey Google, call my daughter." No screen interaction required.
Complex routines chaining multiple devices. Multi-device ecosystems requiring a hub. Anything needing regular app maintenance from distance. Cameras unless medically necessary.
Can your parent use it without opening a phone app? If not, simplify.