A friend registered me with this site several years ago (and I don't think I've visited it since,) I was very surprised to receive an email re your message - and very pleased.
What a small world - you mention you were born in Velsen-Noord in 1944, - well, I was born in 1944 in Beverwyk, and our family migrated to Australia in 1954.
My father's name was Arie Tervoort - Mum's Apollonia van Acker (van Ijmuiden-Oost). My father did mention that he had a cousin Dirk who migrated to America and I wonder if you might be related to him.
In the late sixties we had a surprise visit from a Gary Tervoort from Holland, Michigan who at that time was on R & I leave from the Vietnam war - I wonder also whether he might have been known to you.
I'm at the local Library at present and they are closing in 2 minutes so I'll sign off, but would love to have further communication with you re faily ties/origins.