I hate to quote Nancy Reagan, but "Just say NO." Once you practice it a few times, it's easy. "NO" is a complete sentence!
And, I have to add that, spending time taking care of your own children is NOT babysitting. You are learning TTATT, and that is great. Freedom! It also means freedom and EQUALITY. Your wife is not the caretaker of your family - you are a team. Babysitting? Really? <=== that is reality in the RW. Don't worry - it's more fun than the JW way, and the kids - they will give you so many laughs, and your relationship with wife is so much better when you are equals. x