I don't have any paper for the parents, but each child has a notebook that I call my log books with all food, naptimes, diaper or potty times with bowel movements noted. It is for me not for the parents. For food I keep track of when they ask for seconds and what they will not eat because it changes over the years. For naptimes I can track the times if I need, especially for newbies. For diaper changes and bm times it helps me know their habits when they start to toilet train.

Also, if I'm ever audited my grocery receipts match the food notations in my log books. I like my system a lot.