Using 'FaceTime" to communicate between various devices on the same apple ID. I have used macs for many years but have only recently updated to a MacBook Pro, iPAD and iPod Touch. We can "FaceTime between these devices and all the mac stuff our children and grandchildren own BUT not between all the devices we currently own. I am my 70's so mentally getting out of date with modern trends. Any suggestions, I suspect it is easy but I have not twigged yet.