Correct, to get germs away you should sing the “happy birthday song” twice while rubbing soap and water on your hand.
The answer is true
Immediate family would be your mom/dad and siblings so extended family would be the other family members
The temporal lobe controls short term memory so this is most likely your answer.
There will be a slim chance of the brother be affected because the trait would turn out to be recessive which means the person genes would be carried out without appearing in that person