I absolutely believe it can. Although I would have to make a point about your question. You asked,“If not for parents or children”. I would dare to say there are a lot of children & parents for whom unconditional love does not exist at all. I am a firm believer that blood is not what creates a bond of love. I think the term is a little tricky though. For example; my best friend has been just that for over 30 years. I believe I love her unconditionally. However, if I woke tomorrow to find she was really a mass-murderer on the side – I would certainly not like her or her actions…but I would still love her deeply. I think those same feelings would apply to my children if I found myself faced with such a realization about them.