Flashing or strobing light system for hearing impaired

Hello, My parents are Deaf and we have the Ring doorbell 2 set up! It’s great and linked to their phones but would be great if there was something for our Hearing impaired users. Something that would be linemen up to the house lights where they could flash when someone rings the bell. We had a system like this before with our old doorbell with flashing beacons in every room but since ring has been installed we don’t have that anymore as we took away the old doorbell. It would be great if someone could come up with an idea for our hearing impaired compadres.