What about some team building projects or games to get your two kids having fun together instead of being adversaries for mom’s time and attention? I’m thinking easy stuff like baking or cooking together (turns on ingredients), washing windows with spray bottles of water, making homemade playdoh, etc.
Good preschool stuff depending on what you want:
The Letter of the Week stuff from Confessions of a Homeschooler is fun but tons of color printing and gets repetitive. Read through her blog and you can download it all free, it just is separate links. I would print off a few different letters/activities from her free before buying. See if your 3 yo likes it.
With my oldest I did the original Letter of the Week (Brightly Beaming Resources) and its still free online. You take a letter for the theme of the week, read books, practice a number, color, shape, etc. While she has ideas for each you can adapt to your child’s interests. So if I were doing one for my just turned 4 year old I would do A is for Airplane, while his younger brother would love T is for Trains and my oldest daughter liked A is for Aligators. It’s really simple, no printables really.
With my current preK range boys I just read good picture books with them, give them specific fun activities, etc. So I have boxes with things like:
Wooden pattern blocks
Melissa and Doug magnetic fishing puzzles
Counting bears
Toy clock
Playdoh
Puzzles
scissors and glue
Dry Erase books on letters, numbers, mazes, etc.
Attribute blocks
Then they get a different thing to use each day or every half hour if we’re doing concentrated table time.