In his will, Amberley named Douglas Spalding and T. J. Cobden-Sanderson as Frank and Bertrand's guardians, not wishing his children to be raised as Christians, but Lord and Lady Russell successfully contested the stipulation and assumed full guardianship. The deeply pious Lady Russell, notwithstanding her undoubted disapproval of its content, made sure that her son's book was published a month after his death. She wrote in her introduction to "An Analysis of Religious Belief", that while some would find "their most cherished beliefs questioned or contempted" by the book, they should recognise that her son wrote it in what to him was "the cause of goodness, nobleness, love, truth, and of the mental progress of mankind." Both of Amberley's sons eventually succeeded to the earldom.