Claire,
Attached is Patrick's civil birth record. He was from the town land of Culkeen, RC parish Kiltulla, Roscommon. On the website, irishgenealogy.ie, I also found the births for these siblings:
Thomas Glynn 8 May 1915
Mary Ellen Glynn 12 Nov 1918
James Joseph Glynn 6 May 1920
Michael Peter 17 Jun 1922
Annie (synonymous with Nancy) 23 May 1924
I could not locate the birth records for the other two siblings you mentioned. Delia is another name for Bridget. I looked for Thomas and Anne's civil marriage record, but came up empty handed.
In the 1911 census for Culkeen, there is a John Glynn, head of household, widower, age 68 living with his son Thomas, age 35, single, daughter Bridget 21, and daughter Margaret, 19.
I then found Thomas' civil birth record from 1874 showing his mother was Mary Godfrey. It is attached as well. I looked at the paid site Roots Ireland to view his church baptism record to find that the two baptism sponsors were interestingly Enda Bermingham and Mary Bermingham.
Regards,