Include the Just5 cell phone in the list. This is the most helpful thing you can give to dads or grandpas especially if they want to live an independent life. This cell phone has emergency features that can be of help in just a press of a button. The phone can automatically contact pre-listed numbers and give off a loud alarm to call for help. The phone can also be used as a traditional phone without much problem because of its bright display, amplified sound, and big buttons. Check this phone here: www.just5.com.