The Helen Real on the 1930 census is probably the Nellie Real on the 1900 census (same age and the parents birth places are the same for Delia and Helen).
Thomas Real
One of the 3 other children on the 1900 census is Thomas REal born 1888. He is on the 1910 census as a roomer, single & employed as a driver:
Source: Manhattan Ward 21, New York, New York; Roll: T624_1037; Page: 3B; Enumeration District: 1253;
Thomas is on the 1915 NY state census, unmarried, mechanic
He is on the 1930 census, still in NY unmarried and a mechanic:
Source:Manhattan, New York, New York; Roll: 1564; Page: 6A; Enumeration District: 0651
He is at the same address in 1940, still single and now a porter at a bank.
Molly Real
The 4th Real child on the 1900 census was Molly Real born 1893
Molly (Mollie) is still at the St Josephs orphanage on the 1905 state census
Ray