Thanks for your message. I had a look at the available marriage records for the area.
There is a record for Edward Tully and Bridget Molowny, who were married in Tuam parish on 8 October 1839; witnesses were Denis Nocton and Catherine Healy. A child of this couple was baptised in Lackagh parish in 1844, sponsors John and Anne Tully.
This may not be relevant but thought I'd pass it on just in case. Didn't find anything of relevance directly in the parishes you mentioned. Hopefully someone with further knowledge of the family might see your post and offer some information.
IrelandXO Network Leader