In reply to hpil:
Try Niedere Tauern area - no glaciers, but lots of little rivers and lakes to keep children happy (did this with my parents the same age). Hut to hut perfectly possible, some summits along or just off the main route.
For a completely different landscape, Totes Gebirge provides a karatst plateau to be crossed in 4-5 days. Again AAC HUTS available.
If specific information is needed, just Pn ...