This means that a parent who is able to learn the piano and is good at it may not be able to pass on the skill to his child. This is because the trait is acquired while the person is living.
This is not something that is inborn and it may not be part of the genetic makeup of individuals even if they are related to various people. There are still some reports and studies that are being done about this. Some experts are not convinced that these acquired traits have no trace with their other relatives and their offspring.