Does anyone even listen to creationists these days?

[Gilrandir]

Take my dad and myself, we were in a car and someone said something on the radio. My dad made a joke and I wanted to make pretty much the same joke at the same time, same input, similar brains, same/very similar output.

All (human) brains are similar. In your case it would be more accurate to speak of similar minds which, however, has doubtful relation to inheritance. Minds are more nurture than nature. I have similar experiences with my daughter and my best friend, yet practically no with my wife. Evidently the same input and similar/different minds can as well produce both different and similar output. Has something to do with mind tuning.