Jamieson, Fausset and Brown on Exodus 12:26

26. when your children shall say, ... What mean ye by this service--Independently of some observances which were not afterwards repeated, the usages practised at this yearly commemorative feast were so peculiar that the curiosity of the young would be stimulated, and thus parents had an excellent opportunity, which they were enjoined to embrace, for instructing each rising generation in the origin and leading facts of the national faith.