The DNA tests associated with deep ancestry look at the mitochondrial DNA which everyone has but which is inherited from your mother, and the Y-DNA which is inherited from the father, but only males have a Y chromosome and Y-DNA. I assume you are from your name that you are female, so no, this type of DNA test wouldn't help.
There are different DNA tests which look at different genes and chromosomes. Similar to paternity DNA testing, you want a sibling DNA test. A few websites to look at are:http://www.rumykid.com/siblingdnatesting.htmhttp://www.ibdna.com/?gclid=CPGr3rze4pICFQU11AodFy9K_ghttp://www.whozthedaddy.com/acatalog/dnatests.htm