Seeking b-family "Sanders" family

Hi! I found my bfather in St. Petersburg... (he got mom pregnant when she was 16 then took off!) I was conceived in Shelby co. Mom's name is Lottie Adams: her brothers are Henry, Dooney, Tommy, and Dooney Adams. They lived with their Aunt Ada on Fite Rd. Father is Donald Bruce Sanders; his siblings are Janie Sanders Dreher -younger-(Franklin TN) and Ronny Sanders -older i think Donald's father died around the time of my birth... I'm told this is why no one told Don's mom about me and why Don had/has a very rought life. I've mssg'd Don via classmates.com ... he's responding, sporatically, but not addressing the issue of him being my father. I'm also in email contact with his sister, Janie. Janie tells me that my bfather, DONALD BRUCE SANDERS, has a son in his early 30's with wife #1, and 2 daughters with wife #2. Janie won't tell me the names of the 2 ex-wives, or the names of the kids, or the current wife's name. I understand... this is all new to her... just contacted her this week. The youngest daughter is in KY with her mom and a new baby. ussearch.com and yahoo search have TONS of Donald Sanders! How can I limit it down to Donald Bruce Sanders, without paying the fee for ussearch? And how can I get more info on my half-siblings? thanks!!