what is the name of the person who has relations with sarah lennox and charles lennox ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_relation dbr_Sarah_Lennox,_Duchess_of_Richmond_and_Lennox sep_dot var_uri dbo_relation dbr_Charles_Lennox,_2nd_Duke_of_Richmond sep_dot var_uri a dbo_Person brack_close