Sidney Yarrow was the eighth of the fifteen children of James Yarrow and his wife Adelaide (née Bishop) of Wilburton, Cambridgeshire, England.
When Sidney was just two years old, he contracted Bronchial Pneumonia and died of exhaustion at the family home in January 1909.
He was the second son, within the first eight children, to die in infancy. His older brother George James Yarrow died at just 18 days old in 1901.
- 1906 at Wilburton, Cambridgeshire, England.
- 31st March 1907 (Easter Day) at St. Peter's Church, Wilburton, Cambridgeshire, England.
- 2nd January 1909 at Railway Cottages, Wilburton Station, Station Road, Wilburton, Cambridgeshire, England, aged about 2.5 years old.
- 6th January 1909 at St. George's Church, Little Thetford, Cambridgeshire, England.