Offer your thoughts or opinion on the input financial query or topic using your financial background.

Should I charge my children interest when they borrow money? 
Parents are eminently capable of gifting to their children.  If it's a gift call it a gift. If it's not a gift, it's either a loan or a landmine for some future interpersonal familial interaction (parent-child or sibling-sibling).  I an concerned by some phrasing in the OP that it is partially down this path here.  If it's a loan, it should have the full ceremony of a loan: written terms and a payment plan (which could fairly be a 0% interest, single balloon payment in 10 years or conditional on sale of a house or such; it's still not a gift).