up to the 12th generation
0━┳
Owen Douglas Marks † & Nora Yarick †
┗━1━┳
Owen Douglas Marks 1924 &1946 Vida Gwen Scudds 1925
┣━1──
Marilyn Adelle Marks 1948 &1967 Brian Edson Ivas 1947
┗━2──
Robyn Priscilla Marks 1951 &1973 Martin Patrick O'Loughlin 1952
Total: 3 descendants (8 individuals with spouses)