Is Medication Advisable For A Child With Mild ADHD?

My nephew was diagnosed with mild adhd .he is seven a bully in school,his parents separated four years ago.all three finally go to counseling.he has always disrupted everything since pre k to present.my brother has custody.he is highly intelligent almost to a fault.he has had testing done for food allergies etc....no school friends, almost daily bad reports from his teacher.the school counselor has constant contact.All are at their wits end.All homeopathic remedies have been tried.Kody defies authority,no fear of consequences just says I don t care.My sister lives w/ my brother she had aTBI 30yrs ago.She works drives etc.Damage to the brain was on the left side,short term memory frustsration,short fuse.Kody treats her horribly,my husband witnessed himself today.He was so upset etc He would never pull that w/ me.Bottom line I told my brother today in haste,he may need medication.His mom recently went on bipolar med.@ 36.seems to make a difference.