Can you go to family counseling where everyone goes together (mom, dad, brother…)?

Yes. Of course! call your therapist and ask for some referrals!
Yes. Yes you can. Family counseling is all about getting either the entire family together or several members of the family together to improve communication among family members, and also improve overall family functioning.
Yes. Family counceling by definition involves the whole family. Some therapists (lpc, psychologists) specalize in family work. Those that do will ocassional do work with one family member separately while also working with the family to help identify issues that may need individual help.