No, it is not correct.
"I am searching for my brother" = I do not know where my brother is. I am looking in various places to find my brother (e.g. in his room, in his car, at his school, at the park, etc.).
"I am searching my brother" = I am trying to find something. I am looking in various places on my brother in order to find that object (e.g. I look in my brother's left pocket, in his right pocket, under his shirt, etc.).