I think of a friend's almost 20 years younger smart sister. She was a very good student.
Since she was past her middle 20's she did not expect to get pregnant. She liked having sex.
She got pregnant from a low IQ guy and her son is 'slow' almost as bad as his father.
I have two cousins both top graduates who married high IQ persons.
Both had 4 children and all 8 children are very smart like the parents.
A smart co-worker told me her half-brother was low IQ.
She told me retardation is hereditary.
All we have to do is look up into the heavens and see intelligence in design.
Intelligence shows a mind, a mind shows a person, and a person shows personality.
God's personality reflected in love and wisdom besides His power.
Fascinating as your stories are, but intelligence play no role in theory of Evolution, because there are more to life than humans.
Sure there are chances that a child may inherit some of the traits of father or mother, but that’s not the theory of Evolution is focusing on. Evolution is about population, not individuals of immediate family (father, mother and child, or siblings).
Evolution is about changes that affect a whole population or large portion of a population, and how these little changes add up to larger changes when comparing the earlier ancestors to the most recent descendants.
For instance, go outside of human evolution. The last ice age resulted in divergence of the brown bears that still in more temperate regions, and those brown bears that in regions covered by ice sheets, with no summers for thousands of generations. Those bears that lived in glacial regions have to adapt to such climate, that are more suited for icy climate all year around for generations. Hence no hibernation in winters. Slowly, incrementally, changes occurred with each generations until the brown bears evolved into the polar bears.
These changes didn’t occur suddenly or overnight.
Glacial period can last last for tens or hundreds of thousands of years, with no thawing of the ice sheets.
It is not just the color of hair or fur turning white, their claws have better traction on ice, thicker hair that are better resistant to wind and Water (polar bears spend a lot of time in sea water, swimming from floating ice to ice to reach their natural preys, eg seals, sea lions), have more body fat than brown bears which also provide better insulation from the cold, and their paws are longer which are better suited for swimming, etc.
The divergence between brown bears and polar bears occurred sometimes around 150,000 years ago. The dna allowed that the polar bears are more closely related to brown bears, so they are considered sister species.
A child being dumber or smarter than the parents, played no roles in evolution, and it isn’t the changes Evolution referring to.
Strength, size and intelligence are not the traits of evolution, because there are lot of weak animals that exist with stronger animals.
Many of the large and powerful dinosaurs became extinct, but much smaller dinosaurs, the birds, began to flourish and diversify.