Hi Couple of photos of the twins (Photo 1). First photo Elizabeth (Lilly) and Mary (May) with their mother Mary Jane.
Elizabeth married James Hill on 20 September 1911 and was aged 23 at St Annes Belfast. She had three sons James born 9th April 1912 at 97 Donneybrook St, Belfast. He died 17 Nov 1955 aged 43 (Bachelor) of TB final address 54 Windsor Road. John was born 6th July 1915 and died 5th Jan 1918 (Broncho Pneumonia) he was born 83 Donneybrook St. Gordon was born 23 June 1923 and died 1991 aged 67. Elizabeth died aged 4th Feb 1968 aged 79 if heart disease.
Mary married Samuel Wilson Neil Dunseith on 26 March 1910 at St Annes. They had about 12 children, only names I know are James (Jimmy - died 15 June 1997), John and Sammy. Mary died on 20th June 1937 aged 49 and on her certification the cause of death says unclear. My grandmother say there was a coverup and her husband was very unkind to her. I think he will be the one you referred to earlier. I knew their son Jimmy and he was a lovely man in fact my brother has a tape somewhere of Jimmy talking about family history so we will try to find it. You can find the Dunseith's on the 1911 census at 5 Rainey Street, Windsor Ward.
Mary Jane the mother died on 22 September 1935 of intestinal statis Grave P752 City Cemetery.
James the Father died 16th December 1923 aged 74 City Cemetery - on both these records is says grave owner Thomas Kyle.
Mary Jane Wilson the other sister died 12 December 1965 aged 80 buried in City Cemetery -W1 196-Glenalina Extension
After this I have very little information other than some more photos to say John (photo2 attached) obviously must has squandered the money from the shops. He was a member of the Ulster Sports Club often went to functions at the City Hall, taking my grandmother and was obviously a man about town, although died penniless we think in a lodging house in Bethnal Green late 50s or early 60s.