Welcome to Ireland Reaching Out!
I was not sure what info you were looking for. I located the 1901 census record for the family and since there were a number of Mitchell and Leonard families in Lissyegan, I gave you a link to the entire townland. Same for 1911. You will note that Thomas Sr. was not in the 1911 census. He died two months earlier in January. The last link will take you to a page which includes his death record at age 88. You will have to sign-in to see the record.
Let me know if you have any questions.