Pedro Ortiz de Anda

Reading back through the archives I found a post that states Mr Jaime Holcomb believed Pedro Ortiz de Anda (born c1560) was the natural son of Pedro de Anda Altamirano (c1535-1619). 

He also believed Isabel Ortiz de Anda (cc Pedro Gómez de Portugal), Pedro Ortiz de Anda (cc Ana Ramírez) and Catalina Ortiz de Anda (cc Esteban de Pastrano) were all also natural children (born outside of marriage) of the above Pedro Ortiz de Anda. 

Has there been any research on this family recently that validates or disproves Mr Holcomb's views?

Thank you. 

Travis