name a office holder whose predecessor is john churchill and has son named william godolphin ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_predecessor dbr_John_Churchill,_1st_Duke_of_Marlborough sep_dot var_uri dbo_child dbr_William_Godolphin,_Marquess_of_Blandford sep_dot var_uri a dbo_OfficeHolder brack_close