Sorry for a late reply. The thing is that my great grandfather was born in Santiago and then settled in San Antonio Guaracha, Michoacan near Tanga. We do not know our relatives in Tanga.
My great grandfather was Rafael Vega Collazo born circa. 1888
My G-G granfather was Antonio Vega Alvarez born 11/29/1861
My G-G-G grandfather was Luis Vega born circa 1829
All were born in Santiago Tangamandapio.
My Great Great grandfather Antonio had a brother, Ignacio Vega born on August 1,1870, a sister Manuela Vega born on December 12,1849, and another sister Vicenta Vega born on June 18, 1868. I am sure he had more brothers and sisters, but these are the only ones I know of.
Do you have information as far as grandparents are concerned for your father in law?