Build an App (Android to start, iOS later) to interactively track reminders for Senior Citizens

I want to build an App that will use Google Assistant and Google Home devices (Alexa and IHome Suites eventually) to remind Senior Citizens of things such as taking Medication, Appointments, Birthdays, (whatever they choose to set into the App). Key features: > The App will proactively remind users verbally through Google Home rather than simply showing a phone/tablet screen that may not be seen for some time. > The App should have an option to ask for acknowledgement of important items. (e.g. The person needs to confirm back that the medication was taken as prescribed.) > The App should allow for remote/third-party monitoring, maintenance and setup. (e.g. The child or caregiver of the Sr citizen may set up the medication times and then can be notified if a user has not acknowledged the medication reminder.). This might be better achieved through a web portal. > Once set up, the App must be easy to use with a simple interface and speak in plain language > Allow for multiple languages. That's about it for now. Happy to answer questions.