Yes, that's the 1900 census I am working off of, but am trying to locate an 1890 census from Allegheny, PA that would also show this family. I am looking for John as the "son of head-of-household" in PA since I do not have the parents names. The census also shows his parents came from England, but I think that's just their departure to the US from Ireland.
John appears on the 1910 census at 4 years old, so approx birth around 1906.
I have ordered the certificate of marriage (and affidavit) from NY for Charles Simmons and Josephine Haney. I am crossing my fingers that John and Ella are listed on there, and Ella is listed as Nellie .