which famous writer was married to emily tennyson and had a son named hallam tennyson ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_spouse dbr_Emily_Tennyson,_Lady_Tennyson sep_dot var_uri dbo_child dbr_Hallam_Tennyson,_2nd_Baron_Tennyson sep_dot var_uri a dbo_Writer brack_close