looking for half brother again

I am still searching for a michael e. newall or possible Rothstein. michael was born to a Lori Rothstein, his fathers Name was Alison Newhall, well Alison Newhall was my father as well, I was put up for adoption by my birth mother, and have already been reunited. here is some stats, 1. he was born in Los Angeles California. either late late 75 or early 76 2. He may now reside in Arizona Area or Ohio or California?? 3. mothers maiden name should be Rothstein 4. Fathers last name is Newhall. (deceased) 5. the E in his middle name could very well stand for Eugene. I was told that by a friend of my biological mother. any info on my brother would be greatly appreciated!