Alexander settled on his tract in what is now Alexander Valley .
After Alexander 's contract ended in 1845 , Mose Carson , brother of Kit Carson , took over as manager of Rancho Sotoyome .
Alexander settled on Alexander 's tract in what is now Alexander Valley .
After Alexander 's contract ended in 1845 , Mose Carson , brother of Kit Carson , took over as manager of Rancho Sotoyome .