name a office holder whose predecessor is archibald wavell and has son named patricia knatchbull ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_predecessor dbr_Archibald_Wavell,_1st_Earl_Wavell sep_dot var_uri dbo_child dbr_Patricia_Knatchbull,_2nd_Countess_Mountbatten_of_Burma sep_dot var_uri a dbo_OfficeHolder brack_close