How do I make a 3 dotted brush

I'm interested in making a three-dotted brush. Am I able to do that?

I'm also interested in making a dotted line brush, but a row of three lines of dots instead of just one. Is that making sense?

I'd like to be able to draw one dotted line but having identical copies of the line parallel to the line drawn. Is this possible in either Photoshop or Illustrator?