Ok, I'm pretty sure no one posted something like this.
Sims you'll need:
1. A kid in school
2. A teenager or someone older than kid
Things you'll need:
1. Unfinished homework
2. Something for the kid to do
Alrightie; now:
Step 1. Grab a random sim older than kid
Step 2. Click on the homework
Step 3. There should be a button that says " Do ___'s Homework - 0%
Note:
I did this on one of my teenager's friends, I made her selectable and then it came up. I'm not sure if it works with regular family members, but you could try.

Are you saying that you selected a sim that wasn't part of the family to do the homework? How do you do that? Is it a cheat?

Its boolprop [I Suggest You Dont Try This Though]

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