Since I put up this query more information has been found on My Bradley Family. Patrick died in Knock in 1890 and he and his wife Sarah are buried at Sessiaghoneil Cemetery.
Patrick never went to the USA. He lived and died in Knock
The names that you have mentioned are not familiar with this Bradley Clan. All siblings are accounted for and none went on to California.
Thanks for your help and good luck with your search. I appreciate you answering my query. If I may be any help to you in the future: Please ask