If you select some students, then go to Print Mailing Labels, then click the dropdown, there's "Avery 5160 GP HH1" thru "Avery 5160 HP HH4" -- naturally, some will be blank where we don't have the data, so you'll end up with blanks on the sheet of stickers. There are some stored searches for "GP HH1 OK TO SOLICIT" and for HH2 thru HH4, which will prune down your list somewhat; then, you can turn on Advanced search mode, search for a grade level, and click "Within" to get the subset of the kids in that grade level whose grandparents are OK to solicit. It sounds more complicated than it is -- I made a little screencast showing the steps of
1. Using a stored search to find ALL students whose grandparents' first household is marked OK to solicit;
2. Enabling Advanced Search, and doing a second search for just kindies;
3. Using the "Within" button to find only the kindies whose GP HH1 is OK to solicit;
4. Printing mailing labels for them. (Still one blank, but that's because apparently the family provided the grandparents' names and permission to solicit, but no mailing address. Can't win 'em all.)
Then you'd repeat for HH2, HH3, HH4 (very few if any have more than 2 households provided.)
Screencast: https://www.youtube.com/watch?v=djKQrGzTTUo