Is flat foot heritary?

Let me explain: A flat foot is normal in infants and toddlers, because the foot's arch hasn't yet developed. Most people's arches develop throughout childhood, but some people never develop arches. This is a normal variation in foot type, and people without arches may or may not have problems. There is also type could congenital but rare.

Yes...: It does seem to have a tendency to run in family lines.

Yes: Yes flat feet can be an inherited trait. Other things can cause flat feet also.

Sometimes: Flat feet are very common. Most of the time they cause absolutely no problems and are just a normal variant. In part because they are so common flat feet can run in families but less commonly they can be the result of one of several hereditary conditions.