#1 By the Rasha it says "When he will SAY to you" but by the Tam and Chacham it says "When your son will ASK you". #2 The Rasha uses the word לכם- to you and excludes himself, the chacham also says אתכם but he prefaces it with Hashem Elokeinu- Our God! #3 The Tam just says "What's this? but doesn't specify, like the Chacham who asks for each detail. The Rasha just calls it Work! #4 The Sheano Yodea Lishol doesn't ask so we just find what to tell him. #5 In the way we answer in the Torah we also find a clue: To the Rasha the Torah writes" You should say" but doesn't write "say to him" as it writes for the Tam OR "say to your son" like the Chacham.
But where do we find any mention of different sons AT ALL?
The Haggada says that we find in the Torah 4 Sons!