It seems to me the first misunderstanding when we talk about unconditional love is love is equated with the things we do to express it, but things like hugs and kisses and kind acts is not love itself. The other part is of course the unconditional aspect, and I don't believe that is quantitatively unlimited in terms of the way it's expressed, (atleast in time) whether it's emotional or physical/material in some sense. But to the extent you are able perhaps you can express love toward all.
Naturally, when we think of love we think of giving or receiving love as people, but I think ultimately if you want to talk about unconditional love in terms of an absolute, spiritual sense you have to stop distinguishing between subject and object. Of course, this is where most people will not go, atleast for some people out there who are not close to them. It seems to imply that judgement is involved, because how do you decide who you do love unconditionally, if it's just a matter of loving or not loving as Tracy pointed out? So it also has to do with acceptance. I think most of us can agree that we can show a certain kind of love for human beings in general, even if some of us may feel there are individuals qualify as exceptions to the rule.
Maybe another way of looking at this is that love is itself a condition. I tend to look at it like this: The expressions of love are limited, love itself is not. Most of the time it seems to me that when we talk about love it sounds like some kind of limited, quantified resource, like there's a love store out there somewhere or a love bank. Just as we say: "I love you so MUCH!" (how much?) I just don't think that model applies. If you are "tuned in" to love itself, whatever you think that is, I don't think you'd be too upset if you're not "getting" it from expected "sources," INCLUDING family. In fact I think that's one thing that I learned while I was a witness, (notice I don't say learn FROM the witnesses or the organization) not that I would discard my family, but it's kind of a matter of putting things in perspective. I guess basically, I would say that love is where you find it. No it isn't the same, but why spend time dwelling on what you don't have if you have people who will love you? I think that maybe people who suffer a loss of love from a family member, perhaps due to DA/DF'ing, may find that there is just as "much" or even more love "out there" in some cases, if only one shifts their focus. Remember how in the organization we used to say you have a spiritual family even if your fleshly family aren't witnesses? Well I think that's still true in principle, it's just not the people in the organization.
"Knowing others is wisdom. Knowing the self is insight. Mastering others requires force. Mastering the self requires true strength." -Tao Te Ching, Chapter 33