They went to England before coming to Philadelphia in 1911. Jose Garcia was born in Sama de Gangero, Asturias, Spain Sep 12 1885. His parents were Benino Garcia and Isadora or Sidora Diaz.
Joaquina M Diaz born Bilbao, Spain Jan 7 1884. Her parents were Jose Diaz and Teresa Solis or Solia. They were married Dec 10 1904 in Spain. That's all I know of the past except Jose had a sister Pilara went to Mexico, and I think a brother Juan?

Have you tried to request civil registration records from Bilbao for your ancestor born 1884. They should have them. You need to write them, in Spanish, and give them all the information that you have. Full given name, names of parents, date of birth and that he was born in the city proper (if he was), if they can't find his records then he may have been born in one of the surrounding towns.