You don't specify exactly what you are looking for in your query so I just did a search on www.rootsireland.ie for any siblings of James.
I found that James Finn married Mary keenan in Kilshalvey on 1 Jan 1865
I found records for 6 children...
Source Surna e first Name Year County
ViewChurch Baptism Finn James1875 Co. Sligo 7 nov 1875
ViewChurch Baptism Finn Margaret1 873 Co. Sligo 3 May 1873
ViewChurch Baptism Finne Ony1871 Co. Sligo 29 apr 1871
ViewChurch Baptism Finne Pat 1869 Co. Sligo 27 Jun 1869
ViewChurch Baptism Finn Mary 1867 Co. Sligo 23 jun 1867
ViewChurch Baptism Finn Anne 1866 Co. Sligo 7 jan 1866
Hope this helps in some way,