Your wife is so lucky to have at least one daughter. My wife would LOVE a daughter to shop with. As it is, she shops with her mom occasionally and is VERY frugal.
I'd like to know why you're even going along? No way I'd tag along on a shopping excursion. Do you live far from the mall? We live right next door to one, so it's not a big deal to amble on over there.
How much will they spend? Damn, what do they want, clothes? I figure 2 outfits a piece at $75.00 each. Hmmm, $450.00! Glad I only got two boys! 😛