Have not found the connection to our Jinbei Nishiyama-Higashida (1851-1902) as of yet, but do have Jinbei's father: SAKASUKE NISHIYAMA. Expect he'd be from the same area as the others, Kiyosato-mura (village), Mizuno (area), Tamana-gun (county), Arao-shi (city), Kumamoto-ken (prefecture).
With as much emigration as occured from that prefecture, seems likely that some descendants could have gone to America. Hoping someone might trace their roots that far back and provide the siblings for Jinbei (he was the 4th son per Koseki).