I think it is extremely irresponsible to go out with kids without taking communications gear. More so that the weather is average, and even more so not telling family / a contact on shore contact they weren't going to be back.
I'm a bit angry, and mildly speechless. Could get a good handheld VHF for $200 or less, which is probably what they spent on petrol for the weekend. Let alone bait or soft baits.