I have an old book series that my father passed on to me. It's called Robotech. Most kids probably wouldn't know about it, but parents and grandparents that were interested in science fiction\fantasy might. Robotech is a stunning story of love, betrayal, fighting, and humor. I think that if you like those things, you might like this series. The time changes are a bit difficult to cope with, as there are three jumps in the books where a new generation takes on the main roles. Here is a picture of the series.

The Series.