Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Should I charge my children interest when they borrow money? 
This is not really the focus of your question, but it's worth noting that if you live in the United States (which your profile says you do), there are tax implications for you (but not for your children), depending on whether or not you charge your children (enough) interest.  If you charge less interest than the appropriate Applicable Federal Rate (for May 2016, at least 0.67%), you must pay taxes on the interest payments you would have received from the debtor if you had charged the AFR, provided that the loan is for $10,001 or more (p. 7). This is referred to as "imputed" income.