I don’t disagree; however, I echoe Dave Ramsey, who says, “just consider any loan to a family member to be a gift: if you ever get it back, it’s found money. Expecting repayment just leads to family strife, resentment and hurts the relationship.”
However there are some parents who know how to drive a hard bargain (because they know it's good for the kids) and demand loan agreements and/or ownership rights.
After all, bidness is bidness!;-)