They come back as older solo travelers. They come back with lovers. Sure enough, they come back next with kids in tow, and they need the right kind of accommodation. Many hostels have also become much friendlier about giving a family a corner of a large co-ed bunkroom so all can stay together. Common areas of many hostels may have books and games that appeal to kids.
Some hostels are still decidedly unaccommodating to families and kids.
While great family-friendly hostels can be found anywhere, inquire carefully about urban and seasonal hostels. Some no-curfew hostels and those with bars can be magnets for partiers. Occasionally, would-be hostels attract guests that give them the feel of a flophouse. College dorms and other facilities that are turned into hostels for student holiday periods may have little character and an institutional ambience. In general, problems are rare for those who plan and research with some care.