I am certain we have a match!
John was married to a woman named Ann Elizabeth ("Lizzie") Barcus of Camden, Kent County, Delaware in 1856 and had at least nine children. But, I have seen lots of documents about her - but none of them ever had any name "Dorea" - she was always Lizzie. Nevertheless, I am sure it is one in the same.
Thomas 4 July 1857
John 8 Sept 1859
Roseann 30 August 1861
Edward (Edwin) 1865?
Mary 12 Aug 1867 (marriage cert)
William 25 Nov 1869
Theresa 24 Dec 1871- 19 April 1875
Laura or Laurence 14 May 1874
John 14 Feb 1876
John died on 16 February 1881 of apoplexy. His age was listed as 47. His occupation was listed as a saw spinder. He was buried in New Cathedral Cemetery in Philadelphia.
I am surprised that Susan did not act as godmother to any of John's children (I have all baptismal certificates but 2).
I am very excited - I never knew of this sister. Do you know where they were born? I have reason to believe it was County Offaly.
I can share lots more info - please let me know how you are related to Susan Seery and her relevant marriage info etc.
You may email me directly if you wish.