I think if an institution wants to verify your info, they will ask you for the pertinent contact info directly. AMCAS asks for contact info on the app, but AACOMAS doesn't. So you don't need to include it (I think I included contact info for shadowing but not much else), just have it on hand.
List the tutoring gigs together and the babysitting together, as I feel they constitute different experiences. I don't think it's necessary to list every family and student, just discuss the experiences.