William Dempsy and Mary Griffin research

 Is this them?

http://www.census.nationalarchives.ie/pages/1901/Roscommon/Ballinlough/Cloonreliagh/1663674/

http://www.census.nationalarchives.ie/pages/1911/Roscommon/Ballinlough/Cloonreliagh/760342/

Possibly not, if this is them:

Note: gotta love the age listed: "Full" ... I'm going to start using that!

Jan 25, 1917 William (corrected from Thomas) Dempsy and Mary Griffin. He is from Cloonalough.

But, father is Thomas!  (Mariah's father is Bernard)

Possible: two Williams. The one above is Thomas's son. The one below ... Bernard's grandson? This would explain the age gap with John Lyons?

This is their daughter, born 1918:

Is this the same William Dempsy and Mary Griffin, now living in Cloonreliagh?

William Dempsy and Mary Kate:

No image, Mary Kate marries Patrick Lyons:

No record found yet, but it is possible these are the parents of John Lyons, died 2020.