We have lent money to our children at various times, and always have been repaid. Two out of three children paid on time without prompt, the other lagged with payments and needed reminding.
We also loaned money to friends starting out businesses. Not huge amounts, and we could afford it at the time. Once again, one paid promptly, the other did not (his business was not successful, but that's another story). We never did receive all of the money back from the second person., but have let it go, realizing that friendship is worth more than money, and people have different views on how they handle money. We still maintain our friendship.
We have always understood that you should never loan money you cannot afford to lose, because it is always a risk.
BTW, pedants... notice I have used both lent and loaned. I believe they are both correct, but feel free to correct me!