name the office holder with associate as f . w . de klerk and has a kid named monwabisi kwanda mbeki ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_associate dbr_F._W._de_Klerk sep_dot var_uri dbo_child dbr_Monwabisi_Kwanda_Mbeki sep_dot var_uri a dbo_OfficeHolder brack_close