I guarantee you that if your father is 59, that at some point in his life he's found a way to be more efficient at whatever his workload was at the time than a raw beginner. Design patterns are exactly that: patterns of efficiency.
The terribad thing about them is that they don't often explain why they are more efficient than the the naive path.
I'd recommend that you pose a series of tasks to your dad, and work with him to build them out, rebuilding them several times if necessary, to start that deep understanding of the art. Adopt a posture that this work is critical, and that you are working together. You'll both learn why as you do it.
The terribad thing about them is that they don't often explain why they are more efficient than the the naive path.
I'd recommend that you pose a series of tasks to your dad, and work with him to build them out, rebuilding them several times if necessary, to start that deep understanding of the art. Adopt a posture that this work is critical, and that you are working together. You'll both learn why as you do it.