My thanks to Debra and Sinann for your replies.
Yes, I can understand now that this could refer to the child's marriage, and I do have the details of my Grandfather's marriage in 1913.
My Grandfather was Michael Sheehan, born Midleton in 1877. Died In Rostellan in 1934.
His sister was Hanora Sheehan, born Midleton in 1879. Died in Midleton in 1881.
I have Baptism records for both.
The marriage I am looking for is for the parents of Michael and Hanora.
Father : John Sheehan. Born approx 1850. He died in Midleton in 1879, age 29 years.
Mother : Cath'n (Katie) Lawton. Born approx 1852. She died in Midleton in
1880, age 28 years.
Having marriage details for John and Catherine would enable me hopefully to find a generation further back.
Any help would be really appreciated. With thanks