His father, Jasper Sievers, is of Holsatian origin and was the head of the military headquarters of general Ruzskiy who commanded the Northern District at Riga.
The baptism protocol from the Anglican church says that the family resided at Malaya Italyanskaya (Little Italian) street in Saint Petersburg.
Close to the Feast of Pokrov (Protection) of Mother of God he was sent for execution but remained alive after being wounded in the right arm.
In the night the wounded Sergius was pulled out of the pile of corpses by monks, disguised in a Red Army uniform, and delivered to his mother and then taken for treatment to the military hospital in Tikhvin.
Remaining in Tikhvin, Sievers became the club manager, read educational lectures in the hospitals, went on missions regarding the provision issues.
Sievers's position (January 1919) was letter-carrier on the Saint Petersburg section of the Moscow - Vindavo - Rybinsk railway.
According to the documents of Central State Archives of Saint Petersburg the last secular position of Sievers was service as manager of Tikhvin garrison club in 1919-1922.
On May 9, he was to be drowned in the Great Fergana Canal, but Kolkhoz workers pulled him out; on the way to the cemetery, water spilled and he revived.
A memorial service was served at the Church of Saint Nicholas in Kuznetsy and he was buried at Nikolo-Archangelski cemetery in Moscow.