name the office holder with associate as george w . e . russell and has a kid named walter rothschild ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_associate dbr_George_W._E._Russell sep_dot var_uri dbo_child dbr_Walter_Rothschild,_2nd_Baron_Rothschild sep_dot var_uri a dbo_OfficeHolder brack_close