comments:
ryanbuckner posted on r/smarthome12w
The simplest might not be the best. But if you don't want to have a smart home hub you can install a Wi-Fi window / door sensor and share the device to your account. Something like this. They will need Wi-Fi in the house. I would also recommend (from experience with someone with dementia) to make sure you monitor the temperature in the apartment remotely. https://www.walmart.com/ip/Homezone-Wifi-Smart-Wireless-Window-Door-Alarm-Sensor/5212591411?wl13=5969&selectedSellerId=0&wmlspartner=wlpa&sid=4a4faee7-91be-4cee-80d4-37cd72277f24