Do your parents have smart phones? There are 'chatting' apps, biggest one called Whatsapp, that my parents, my sibling and I (spread across 2 countries, 3 cities) have on our phones. We have a 'group chatting room' where we chat, send photos and videos. It is a lot more conducive to group conversations than email or text message - I think it's the format. No one responds in 'real time' due to time dfference & being busy, but the conversations take place continuously over the course of days so we know what each other is up to.