I have two children:

Prior to them, I didnt think that behaviour or traits are inheritable.

When one of them was aronud 3 or 3.5, I observed an interesting behaviour: It was about the meal, which contained fries - and ketchup. He saw that the ketchup was flowing slowly towards the fries and reached there finally - he became funnily hectict, trying to prevent even more ketchup touching the fries.

Today I think he behaved that way ... because ... on my plate which fries & ketchup ... if this happens ... then ... you know :-D :-D :-D :-D It drives me nuts, really - if I am at a restaurant, I ask always for separte plates for things which are fried, because I love the crust and it gets destroyed if any type of gravy is scattered around the plate :-D

Or maybe my son just found out the same, and then there is no inheritance. Im fine with this as well. :-D

But what I can clearly see, is: In their body shape I can see that their mother and I were super-fit-in-shape when they were "created".