ADHD IS THIS A KIND OF DEPRETION TOO CUS I

ADHD IS THIS A KIND OF DEPRETION TOO
CUS I THINK MY BROTHER HAD ONE WHEN HE WAS @ HIS 16+
THEN SUDDENLY HE STARTED REACTING WEIRED,LIKE AGGRESSION,SHORT TEMPERED,SOME KIND VOICE HEARING,LESS OR ALMOST NOT SLEEPING, WHEN HIS DOCTOR GAVE HIM MEDICINE HE NEVER WANT TOO TAKE IT,BUT HE TOOK MEDICINE HE STERT ACTING NORMAL,
BUT AFTER FEW YEAR HE DIED IN AN ACCIDENT, BUT NOW IAM SCARE WAS THAT ACHD ?OR IS THAT GENETIC ?, LIKE IS MY KIDS NOT GONA HAVE THAT I WISH, DO I TELL MY KIDS DOCTOR TOO SO THEY CAN SEE IF MY KIDS ARE NORMAL, I AM JUST SCARED ABOUT MY SON, CUS DOUGHTERS ARE VERY SMART BUT MY SON'S NATURE TOTALLY DIFFRENT, HE IS VERY ROUGH,AGGRESSIVE, SHORT TEMPER,HE IS 7 BUT HE CATCHING HIS STUDY, BUT STILL