Pedro Alvarez de Navia- Tlaltenango

Hello,

I'm looking for any information about Pedro Alvarez de Navia. He was a resident of Tlaltenango about 1640-1650. The only thing that I know is that he was the "nephew" of Francisca de Molina "su tia" (Tapia or Bobadillo) wife of Antonio Vela. Both were godparents in a baptism in Tlaltenango where the relationship was stated. I want to understand how he was related to Francisca

Thank you in advance

sus