Should I include this on a resume?

I did a 3-week unpaid internship at my dad’s law firm in Florida a few years ago. I mostly just did the job of a secretary or an assistant to law clerks with filing, answering phones, checking attorney stuff for grammar, filling time sheets, etc. This was back when I was interested in law, but now I’m more into business, Econ, and finance type stuff. I’m applying to the big dogs (Wharton, Columbia, HYP, Dartmouth). I have my own little tutoring business, but I never did a professional internship aside from this. Would including this benefit my resume? Does it look like professional job experience, or more like a 3-week-long “take your son to work” thing? I would rlly hate for it to go to waste.

Was this in middle school?

Why would you be expected to? Serious professional internships are offered to college students.

@PrimeMeridian it was over summer between my 10th and 11th grades, so I really should have said “a few summers ago.” Anyway, I wasn’t even thinking about including it anymore but I stumbled upon some admissions forums that said things like summer internships or academic summer camps would look good, so I figured i would include. Is this the move?

PS I’m a senior now