The Mantua National School (1822-1997) Souvenir Book lists some of your family, including: Willian enrolled 1890 age 6, Mary enrolled 1892 age 14, Sarah enrolled 1905 age 7, Maggie (Margaret) enrolled 1895 age 7. The book was published by Boyle Print, ** (079) 62890.
A video was produced at the same time. For Carrigeenacreeha townland details and maps check your local library for the 'Resource County Roscommon 2007' CD. Suggest you do not pay a cent for Irish research until you know what you are doing. For change of occupiers of land from 1858-c1920 see LDS film 867952. For 1825 Tithe Applotment records see LDS film 256626.