The Seely family initially arrived in Utah in 1847, and then in 1851 were sent to San Bernardino, California. In 1857 they were called back to Utah because of the threat of Johnston's Army and arrived in Utah in 1858. They settled in Mt. Pleasant, Utah in 1859. Further research is needed to determine the name of the company they traveled with.In some sources their surname is spelled "Seeley."William was born during their time in California.His death certificate and the inscription on his gravestone confirm his birth and death dates.