A few places to see and things to do for families planning to visit Rome with kids.
-Biopark at Villa Borghese (address: P.le del Giardino Zoologico 1, Villa Borghese); open daily: from 9.30AM to 5PM;
-Explora, Museum for children (see at www.mdbr.it);
-Aquatic park Zoomarine, in the surroundings of Rome. The park is located in Torvaianica (litoral), Pomezia, 25 kilometers from Rome. For info ansd directions, see http://www.zoomarine.it/indexuk.php
Also a book Rome with kids could offer useful tips.