which spouse of henry petty-fitzmaurice a mother named louisa hamilton ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_parent dbr_Louisa_Hamilton,_Duchess_of_Abercorn sep_dot var_uri dbo_spouse dbr_Henry_Petty-Fitzmaurice,_5th_Marquess_of_Lansdowne brack_close