Since Bobby's full name was revealed to be Roberto Alejandro Martinez-Millan Luis Santiago, Jr. in "Study Muffin", Mr. Santiago's name could be Roberto Alejandro Martinez-Millan Luis Santiago, Sr.
He's not seen or mentioned in either "Shell Shock" or "The Loudest Mission: Relative Chaos", both of which Maria Santiago appears in. In fact, in both episodes, Maria appears to be raising Bobby and Ronnie Anne as a single parent--this is (sort of) confirmed by Maria herself in the latter episode, as she further implies that she's raising Bobby and Ronnie Anne as a single parent. However, in "Garage Banned", Bobby mentioned that his "PAPA" thought he saw a mouse in the store. He could've meant his actual father, or his grandpa Hector.
It is unknown as to what became of Mr. Santiago, but with this info, he and Maria are possibly divorced or separated.
"There's Nothing Here!"
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