I'll say it again, cars are intentionally designed to make any attempts at communication between humans a hostile act.

I was honked at by someone in a van yesterday, I was thinking maybe it was someone I knew so I looked, but as I did a truck pulled up in the empty lane between the van and me, and I found myself just looking at impersonal hunks of metal glittering in the harsh sun. You could not tell if there were even humans in either vehicle.

Tell your family if they want to interact with you in a human way, to get on their bikes and come out and ride too!