I would imagine if it's in the character infobox, that would be enough. Keeping it as "the son of Tony Zucco" in the description condenses it enough without repeating what's already stated elsewhere in the article.
The character gets far more page views (as seen on Special:Insights, and a lot of the page views for the episode is bound to be people searching for the character and landing there instead), and far more links to it (as seen on Special:WhatLinksHere, and out of the 9 pages that link to the episode, 1 is a redirect and 4 contain links that are actually meant for the character). Additionally, as a series progresses an old episode becomes less relevant and less looked up but a (if not the) main character remains important. But then it's your wiki, so do as you wish. Got to say though, it's a bit unusual for a series to use the full names of main characters as episode names, titles or just first or last name is more common and would avoid an exact duplicate, that's a shame.
I totally hear what you're saying, but I've found that, working on a number of wikis previously, having this sort of hierarchy generally works best. Of course, I'm not averse to changing it in the future, but for now it's not really a problem.