hallo Theo!! Thank you for your email. Was your grandmother or your grandfather a Sikkenk? My grandmother on my fathers side name was Treintje Atsma and her husband's last name was Sikkenk I don't even know his first name as I never knew him. My fathers name was Aris Sikkenk, and he had two sisters I just know them as Tante Greet and Tante Rie. They all live or lived in Amsterdam. Please email me back my email is
Rednose18@hotmail.com Thanks again Kitty