Be sure to order your FTDNA kit through a project - that way if there are any discounts for going in that way you'll receive them. It's okay to take a "guess" and then move to a more appropriate project when you get your results. Ex. your brother orders through a surname project for y-dna. You might get a slight discount if you order that way & do his mtDNA. As long as you have the same mother, his spit will do