Jones Ancestors IN Corris Wales

I am searching for information about my great-grandfather's siblings. They are originally from Corris, but emigrated to Liverpool, England. My great-grandfather is Lewis Jones (b. 1852, d. 1925 in New Jersey, US), married to Elizabeth Emma Bennallack (b. St. Austell, Cornwall circa 1857, d. 1900 in Liverpool). His sister is Mary Jones Williams (b. 1853, d. ?) and I have contact with her descendants. They had another sister, Jane (b. 1858 - maybe) but we have no information about her. Not much to go on, but it's worth a try.