I've always heard it pronounced "Berenstein", (rhymes with "Frankenstein") but that doesn't mean it's spelled "Berenstein". I guess the only way to tell is to find out how the writers pronounced their name.
"I reject your reality, and substitute my own!" Adam Savage, Mythbusters
I remember them as "-stain" but also that it was widely mispronounced; it seemed to depend upon whether you were endlessly reading those books to your kids, or just had heard of them. Those of us In The Know ...
One against one. LOL I'm telling you there are over 60 pages of this being discussed. Most clearly remember stein. Looking all over the internet it is stain. Anyone else want to weigh in? I always remembered it spelled with stein. Weird!
I know the topic is old but there is another way to say it from Appalachia. We pronounce it as steen. It always confused me too
I am the poet of the body and I am the poet of the Soul. The pleasures of heaven are with me and the pains of hell are with me. The first I graft and increase upon myself, the latter I translate into a new tongue.
There are more. Remember Snow White and mirror, mirror on the wall? It's now 'magic' mirror and always has been. There are a lot more. It's called the Mandela affect where some clearly remember things a certain way and now they are different. Look it up. I always remembered mirror, mirror on the wall. not magic mirror.
In Star wars when you hear Luke, I am your Father, now it's something else. On that one, I'm not sure about.