Also known as M G Vallejo or Don Vallejo.
Jacob Leese was his brother-in-law
Victor Prudon was his secretary, business agent and interpreter. Victor was also a schoolteacher
He became a state senator in 1850 and also head of the State Land Claims Committee.

Here is his brother Salvador in 1850
1850 Sonoma Co, California
Dwelling 84, Family 85
Vallejo Salvador 38 M Merchant 20,000 California
Vallejo Gertrudes 38 F California
Vallejo Maria A. 7 F California
Vallejo April 6 F California
Vallejo Ignacio 2 M California

And here is Mariano
1850 Sonoma Co, California
Dwelling 111, Family 112
Vallejo M.G. 44 M Farmer 150,000 California
Vallejo Benicia 32 F California
Vallejo Andronico 16 M California
Vallejo Fanny 14 F California
Vallejo Adelia 13 F California
Vallejo Natalia 12 F California
Vallejo Platon 8 M California
Vallejo Joveta 6 F California
Vallejo Uladislao 5 M California
Vallejo Benicia 2 F California