There are definitely ways to move children and elderly people via bicycle, although doing both at once might be challenging. I'm currently looking into buying

There are definitely ways to move children and elderly people via bicycle, although doing both at once might be challenging. I'm currently looking into buying an electric cargo bike called the Tern GSD: https://www.ternbicycles.com/bikes/gsd https://www.ternbicycles.com/bikes/gsd. I rented one for a day and I could carry my adult partner on the back with very little effort. Two children would fit on the back easily. I really think electric bikes are a gamechanger for mobility for the elderly. My father has an electric bike that allows him to go to the post office, wander the bike paths etc. without overextending himself. Even if your parents are too old to safely balance on a bicycle, they might be able to handle an electric tricycle.