Startup Idea: User-friendly Video Chatting Software for Elders and Children

Startup idea to develop a user-friendly, foolproof video chatting software that can be used robustly between elderly people and young children, where simply clicking on an image triggers a call. The software should also include features for multiple users and secure calling options.

I need a software that would allow my aging mother to video chat with her grandchildren--not Skype or Facetime, because both are too challenging for both my mother and her very young grandchildren to use.

I need something that both could just click on without having to know anything else.

The kids could just touch an icon on their Kid phone (a picture of grandmas face) that would call grandma, then grandma just just click on the answer feature and then the two could start talking.

The whole system would have to be foolproof and much easier than the stuff that is out there now.

Also, it should allow for multiple pictures so the kids could all or answer different grandmas and grampa's (and pictures of the different grankids on the grandparents phones).

There should also be a means for not allowing the kids to send or receive calls to or from anyone that has not been set up for them. I don't think there is an app that does all this, but if there were, I would buy it.