My name is Ray Cronk, my great, great, great grandfather was also Johannes Terkelsen, my grandmother's maiden name was Therkelsen. Her father was Victor, and his father was Eduard and his father was Johannes. I have been trying to find a relative that still lives in Denmark. Do you have a facebook page? I sent a message to someone with the same name as yourself after reading this message. My email is firstname.lastname@example.org
I hope to hear from you! my family will be so happy to hear from you! I too have recorded the family back to late 1780's.