Alixz,
Thanks for sharing the story on your grandparents. I like the way your grandfather called you liebchen. When people have from origin an other native language they often express themselves in that language when being angry or showing affection. Like my father- he's from Suriname- always scolded us or called us by our pet names in his own language, tho we speak normally Dutch.
Yes, Dutch and German sometimes sounds alike, so it's very easy to pic up.
As for the quote I don't know who wrote it, let's say anonymous.
Anna