Reading, Writing, & Spelling: Talk to your spouse in secret code. It will drive your older kids crazy and improve their vocabulary.
Example: Dad: "Do you want to go get some frozen bovine lactation?"
Kid: "I DO, I DO! What is it?"
Dad: "Figure it out and I'll give you double!"
Kid:"Where's the dictionary?"
Mom: “Tonight we are having legumes. Do you want double?”
The kid, remembering the frozen bovine lactation, says,
“Yes! I would love double!”
At dinner the kid says: “Hey, why do I have so many beans on my plate?”
Mom laughs and says, “You said you wanted a double portion!”
Now the kid is looking up words to use on Mom!