If your on level 1 (your basic permit) I believe its only 1 non family member and no limit on family members as long as you are driving with someone 21 or older who has had a license for at least 3 years. Once you get your provisional (stage 2) its up to 1 non family member or no restriction on non family members if there is nobody who is 21 or older who has had a license for over 3 years, or not restriction on both non family members or family members if there is someone who is 21 or older who has had a license for 3 years.