I borrow money from my father all the time. he quite often borrows money from me as well, though. If either of us wants something and doesn't have the money at that moment in time, we'll just ask the other to get it and usually the answer is yes. It gets paid back in some form or another eventually, be it cash in hand or through buying something the other wants that costs around the same amount.
Taking out a loan for my own personal expenses is not something I would ever consider, though - I don't even have a credit card. I'm not in a position where I'd need to. Obviously in the future I'll have a mortgage and whatnot, but that's not so much a loan as it is an investment. I also have a student loan to pay back, which is around £17k I think, but that's a completely different matter. I kind of needed that to do my degree, and I don't have to worry about paying it back.