Sidney was born to Kalman and Sutcha Seligson in or near Montreal, Canada on 24 June 1895. He was their third child and the first son. His older sisters were named Hannah and Marion. His family had emigrated to Canada sometime after 1890, but they didn't stay there long. By 1900 the family had moved to New York City. A second son, Philip, was born in New York. The third son and last child, Harold, was born in 1901.
The 1900 US Census shows Sidney, age 4, living with his parents, sisters and brother at 1326 5th Avenue near W. 111th Street. Kalman's occupation is listed as foreman in a factory. The census indicates that Kalman and Sutcha had been married for ten years, which matches with other findings. Also noted on the census is that the family arrived in the United States in 1896. I don't have positive confirmation of that yet.
I know all of this is very dry; unfortunately I don't have a lot of details for this far back in time. I am hoping that this project will motivate me to learn more, dig deeper, and fill in these gaps. The thing about genealogy, for me anyway, has been that I tend to think, "Oh, yeah I knew my grandparents, let's see how much farther back in time I can go." Now I realize that I need to take the time and learn as much as I can about the people who lived closer in time to me, especially since I am lucky enough to still be able to ask my father, and his brother, questions.