Need expert advice. What in is knock kneed and what is bow legged? Are they related?

Somewhat similar. Knock-kneed is when the knees are closer together, and the lower part of the leg may be angled away from the center line of the body. This may result in the knees "knocking" together (or rubbing together) when walking or running. Bow-legged is when the knees are farther apart from the midline, and the lower legs angle inward. It can also be caused by rickets or other deficiencies.