While in New York City, she met Harold Stewart Mc Pherson, an accountant.They were married on May 5, 1912, moved to Providence, Rhode Island and had a son, Rolf Potter Kennedy Mc Pherson, in March 1913.Aimee Semple Mc Pherson (Aimée, in the original French; October 9, 1890 – September 27, 1944), also known as Sister Aimee or simply Sister, was a Canadian-American Pentecostal evangelist and media celebrity in the 1920s and 1930s, famous for founding the Foursquare Church.

In high school, she was taught Charles Darwin's Theory of Evolution.

While attending a revival meeting in December 1907, Aimee met Robert James Semple, a Pentecostal missionary from Ireland.

At the movies, she recognized some of her fellow Methodist church members.

She learned too, at a local dance she attended, that her dancing partner was a Presbyterian minister.

As a teenager, Mc Pherson strayed from her mother's teachings by reading novels and going to movies and dances, activities which were strongly disapproved of by both the Salvation Army and the religion of her father, James Kennedy, a Methodist.

Novels, though, made their way into the Methodist Church library and with guilty delight, Mc Pherson would read them.On board a ship returning to the United States, Aimee Semple started a Sunday school class, then held other services, as well, oftentimes mentioning her late husband in her sermons; almost all passengers attended.Shortly after her recuperation in the United States, Semple joined her mother Minnie working with the Salvation Army.She had early exposure to religion through her mother, Mildred (known as "Minnie") who worked with the poor in Salvation Army soup kitchens.As a child she would play "Salvation Army" with her classmates, and at home she would gather a congregation with her dolls, giving them a sermon.For a time Harold traveled with his wife Aimee in the "Gospel Car"as an itinerant preacher himself; helping her to set up tents for revival meetings.