irishphiladelphia.com's genealogy maven Lori Lander Murphy returns with another installment of Who's Your Granny (with occasional editorial comment from her dog Daisy).

DNA testing is becoming more popular. There are many DNA testing services, and all employ different methods. Consequently, they may render different results. Some of them are more strongly focused on finding your family history, and some aren't. 

If you're a genealogy beginner, what do you need to know?

Lori explains.