I thought it was a common phrase ... but Google doesn't agree.
I don't want to write stories to let people escape reality but to remind them in which one they are.
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First, a definition:
Remind verb 2 Cause (someone) to fulfil an obligation or to take note of something. - ODO
The dictionary provides some examples with that definition, which I'll sample from and number here for convenience:
Although remind is often used with of, to and that, sometimes (as in case 4), one can simply say "remind (person) X". I can't pin down the conditions fully at the moment, but it seems to work when X is a statement about reality. For example:
In your case, X = "in which one they are". The reminder is about which reality "they are [in]". This is grammatically valid.
Try to enter the following in google search.
"remind them in which"
The results for me currently include your post and:
Tessa Vossen - Teaching and Teacher Learning
29.06.2016 - Remind them in which classes the questionnaire has to be distributed. In general, remind them. And administer who returned how many ...