o'Hagan family search near Maghara, County Derry

Hi! I am researching my late husband's family and will be visiting Northern Ireland next week. I plan on visiting Maghara Tuesday 06/30/26 to see what I can find. Patrick Hagan (1843-1895) immigrated to the United States in the late 1860's possibly with a brother (unknown name) who stayed on the east coast while Patrick continued west to settle near Rio Vista California. He married Maria McNamee (1845-1906) who immigrated to the United States a few years later. I have not been able to find an Irish or US marriage certificate or their birth certificates, so I don't know their parents' names. From Maria's obituary: " Maria, dearly beloved wife of the late Patrick Hagan of Rio Vista and mother of Frank, James, John, Bernard, Hugh, Charles and Maria Hagan and sister of Mrs. Lennon and Frank McNamee, a native of Ireland." I also have another obituary of Patrick's brother (I believe may be a half-brother) "Francis Hagan (1860-1934), beloved husband of Susan Hagan, loving father of Francis J. Hagan, brother of the late Patrick Hagan of Rio Vista California, a native of Maghara, County Derry, Ireland".

I would love to find anything related to our Hagan family, especially Patrick & Maria's parents' names and where they lived. If you have any information that could help, please let me know :-)

Janet Hagan