Also see this if you cant trust Murkoth Ramunni
http://books.google.com/books?id=HHev0U1GfpEC&pg;=PA51&dq;=Thiyya+matrilineal&hl;=en&sa;=X&ei;=TlpPUd2aH8mWiQLgvIDgBA&ved;=0CDYQ6AEwAQ#v=onepage&q;=Thiyya%20matrilineal&f;=false