I keep track of our house/family spending on Mint, which helps me see how much I spend in each category (house, food, health, auto, travel, etc.). Out of curiosity, I checked to see how much I spent on my Kids since I started using Mint. This includes everything that I can identify as kid-specific (clothes, school fees, teacher gifts, summer camp, toys, gifts for friends, birthday and Christmas, etc.), so not food and housing and not health insurance. Turns out to be less per kid than DH was sending for child support for his oldest, who turned 18 this year.