When a neighbor is obnoxious SOMEONE retains an Attorney, advises the neighor he/she is being obnoxious and a claim could be made for intentional infliction of emtional stress, a claim which might or might not be covered by homeowners insurance.
Any person being harassed has the power to call the Police. You don't have to be the homeowner.
You say "your" and "your parents". Who owns the house?