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.
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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