Anne, i sent you an email yesterday to an address i found for you on another site.
Ellen Titterington would have been my great grandmother then....
They in fact had 8 children - the four you name - Joseph, Thomas, Matt & May and also Isaac, Angelina, Getrude and George. After Ellen died, Joseph re-married a woman called 'McKeown' from the Aghalee area - i'm unsure of her first name - and had one more son, Samuel.
Of Joseph and Ellen's children - what I know is:
Joseph - Married an English woman called Kathleen - unsure of her surname and I believe they had two children Ian and David
Matt - I believe he married but haven't found out anymore on him yet
Isaac - Died young, but unsure the reasons why - or indeed how young - I believe a violin that was passed down the family was his.
Thomas - Married a woman called Jessie and they had a son and a daughter called Roy and Shirley
May - don't believe she married but had a son called Ian - May moved to England
Angelina - Married a man called Kennedy - they had 10 children, Trevor, Norman, Jim, Moira, Ella, Mervyn, Gilbert, Tom, Ernest and Dawson
Gertrude - Married a man called Fred - they lived in an area called Gawley's Gate and are buried at Soldierstown Parish Church
George - Born 28th May 1919 - he married Rachel Walker and they had four children, George, Ella, Ray and Audrey - George is my grandfather, making Joseph and Ellen my Great Grandparents.