[1] He was born in Waterdown, Canada West, the son of Charles Sealey and Mary Ann Eaton.
Sealey served on the council for Wentworth County and was reeve of East Flamborough Township.
Sealey ran unsuccessfully for a seat in the House of Commons in 1900, 1904 and 1905, losing to E. D. Smith each time, before being elected in 1908.
[2] For a time, Sealey operated a private bank in Waterdown and lived on the floor above.
In 1887, he interrupted a robbery in progress by firing his revolver after the would-be robbers blew open the bank's safe.