Suggest Treatment To Get Rid Of Dandruff From Hair

I have had a dandruff problem for over a year now. My husband, son, and daughter all have dandruff as well. They have had it for almost as long. My husband and son dandruff problem comes and goes. Mines and my daughters are getting worst. My husband, and son, and myself are African American. My daughter is half white and half black. She has African American hair for the most part. What kind of treatment do I need to do?