Alfred Roberts was an alderman and a Methodist local preacher, and brought up his daughter as a strict Wesleyan Methodist, attending the Finkin Street Methodist Church, but Margaret was more sceptical; the future scientist told a friend that she could not believe in angels, having calculated that they needed a breastbone six feet long to support wings. Alfred came from a Liberal family but stood (as was then customary in local government) as an Independent. He served as Mayor of Grantham in 1945–46 and lost his position as alderman in 1952 after the Labour Party won its first majority on Grantham Council in 1950.