Parents Take a Step, Children Take the Next
G-d's command to Abraham in Genesis 12:1 "Lech lecha - Go forth from your land and from your birthplace and from your father's house, to the land that I will show you" is one of the most powerful and significant verses in Jewish history, setting in motion a journey of peoplehood, ethics, and worship still in force today.
Yet the verses just before it explicitly tell us that Abraham's father Terach had set out already, to go to the land of Canaan (the mystery land is even named!). So we have to ask, why is G-d telling Abraham to "leave your father's home and go to a land i will show you" when his father was already on the way (presumably with son Abraham in tow)?
This question could bear a number of answers. But I want to suggest that if we read it symbolically, then it can be taken as a statement of parents and children. Many, if not all of us, have traits and talents we inherited from our parents, but are able to take one step further. Our parents travel a certain distance with their own skills, and then we get to travel the next part of the way and maybe even reach a destination they could never have achieved. Without them, however, maybe we couldn't get there at all.
And our children will take this inherited spiritual material one step further too. So we should appreciate what our parents have done with what they were given, and that they have travelled the part of the journey that they could. Moreover, without them we wouldn't be who we are and where we are. Everyone does their part.
So Terach might not have known, or been aware, of why he needed to get up and go to Canaan. He might have thought he was going for trade reasons. But in reality, a deeper intention was carrying him along, part of the Divine plan. He was taking Abraham part of the way (to Haran, to be precise), so that Abraham could continue from that springboard. Abraham would eventually have to separate from him, per "Go from your father's house...", but, hopefully (and despite the deep ideological gap between the two), with deep gratitude for everything he had received.