You can only apply for membership if you are a direct decendent of a patriot. You can have more than one patriot but they do have to be a direct line.
Something you might want to do is keep a tree on line that will include your indirect line. That way the info is out there and may help you make a connection to others.
Go to the DAR website to find a chapter in your area. They will contact you and help you through the application process.