There is no way we can reciprocate the love our parents give us. The best we can do is pay the love forward to our own children. When we have kids, we are able to *understand* our parents better. However, we are taught to respect, honor and love our parents later in life. Our parents love us from the moment we are born, a moment that we cannot remember ourselves.
I say this because parents give off much more than love when they raise a child. They give up many dreams and opportunities in order to spend money instead on raising the child. While a kid loves their parents, they do not make the sacrifice that their parents do until they have their own childeren.