Can friends and family sign with my email address? Can I sign on behalf of others?

No, each family member must use a unique and different email address. This prevents spam and promotes privacy. You may sign on behalf of another person if you know their email address and have permission from them. If you have premium services, you may request GoPetition to modify its signature filter to allow multiple signatures from the one email address. If your computer is blocking multiple signatures it may be possible for GoPetition lift the block.