name a office holder whose predecessor is thomas pelham-holles and has son named amelia osborne ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_predecessor dbr_Thomas_Pelham-Holles,_1st_Duke_of_Newcastle sep_dot var_uri dbo_child dbr_Amelia_Osborne,_Marchioness_of_Carmarthen sep_dot var_uri a dbo_OfficeHolder brack_close