(Lord Pevensey)
    Irvine=f
          |
  +-------+----+--+--+
  |       |    |  |  |
Dysart  Helen  m  f  f
        (Nell)

*******************



          +-------------+--------+     +-------------------------+
          |             |        |     |                         |
Chudleigh=f  Hethersett=f  f=====m=====f                  Thorne=f         
         |             |      |     |                           |
      Miriam         Felix  Giles  Letitia               +------+------+
                            (Lord   Merion     John      |      |      |
                          Cardross)         Thistleton=Maria  Fanny  Selina