Thank you for responding so quickly. It is very stange that your sister's name is also Deidre!
I know that my great-grandfather lived in South Africa, but I never knew him personally. My Grandparents had 3 children, my uncle ernest, my dad - William Emil and my aunt - Fiona Suzan. My grandfather had 5 brothers, but only 1 of them are still alive. I've never met all my aunts and uncles, which is a bit sad.
I hope that we are from Dutch origan, because I am crazy about Holland.