TO-DO: Josef's family was found in the Czech Immigration Passenger Lists, Volume IX on pg 146. To verify if Vincene belongs to this family (there is some doubt in my mind that he does since the 1900 census lists his mother as having had only 4 children (not 5) and 4 living), look up that volume and see if any further details are provided. I only had an abstract obtained from Ancestry Plus. Vincene appears on the same page as the rest of this family but is listed as arriving in 1881 instead of 1880 like the rest of them. He was 13 years old at the time.
His details are very similar to Vincenz (James) Rozhon (#2.1). Age and year of arrival. We know #2.1 belonged to Matej's family. Is #9.1 really supposed to be #2.1? Maybe he was related to #9.0?
Joseph (9.0) and Matej (2.0) are very close in age (only a year apart). Were they brothers or cousins?