Tell them that under no certain terms will you tolerate any gang language, gang clothing, gang friends, and so forth, in your home. Adopt a zero-tolerance approach. Stand Firm. Tell them you love them but that you do not approve. Voice the dangers of what gang life can bring; getting hurt or killed, or arrested and sent to prison. Ask them if they want to leave the gang. Keep asking. Leave the lines of communication open. Be supportive, but again, stand firm.