The earth-sign parent and earth-sign child
This pair blends very naturally and comfortably together. The child readily accepts the parent's authority and will take in what the parent has to say, since the lessons, advice, and attitudes are very much in resonance with the child's own nature. The discipline and structure provided by the earthy parent are actually very much appreciated by the earthy child, even if he or she resists them on a superficial level. And the parent truly appreciates this child's helpful, responsible, and sensible ways.
Sharing the natural world together is quite satisfying for these two. There may be little verbal communication between them, but taking walks in the park, camping, working in the garden or yard, or just enjoying a sunset or a snowfall, can be very bonding. Usually there is an unspoken agreeableness between them, and a real sense that they can trust and rely on one another.