Epigenetics for example show that certain gene switches are passed on between generations. Rat mothers that experience anxiety pass this on to their offspring. There is this whole lecture on behavioral biology by Stanford Prof Robert Sapolsky which I highly recommend: https://www.youtube.com/playlist?list=PLD7E21BF91F3F9683 Anyway I think having a clear understanding on where you are coming from, with acceptance, is a requirement for moving into the future with the best of your abilities.