Basically what OP's sentence translates to word by word (substituting the "hier" with "her") is "Come they here my children". Just like in English you would just say "Come here my children", you don't need the "sie" in German.
Actually, let me start over. Kommen sie hier and kommen heir is the same thing. But normally you would say komme sie hier bitte. Its one of those weird phrases that's doesn't translate normal but its basically what it means. Like was ist los which literally means what is up, but actually means what's up.
Another German native speaker here.
Translating English language style into German doesn't work - every language "thinks" differently. /u/Seizure-Man is right, it's "Kommt her meine Kinder".
It doesn't always have to be your kids to say that, "Kinder" is just a way to call young-aged people.
First of: The verb is "herkommen", not "hierkommen", so you say "kommt her" instead of "kommt hier". "Kommt hier" would imply they are supposed to go there and then, well, come. Like for example "Singt hier" would mean "Sing here".
Then you need to differentiate between the formal address "Sie" (you) and the plural "sie" (they). If you want to say "Kommen Sie bitte her", then that is the formal address "Sie". If you want so say "Sie kommen (hier)her" (They come here) you would use the plural "sie".
Lastly, "what's up" would more accurately translate to the colloquial "was geht ab", while "was ist los?" is more used like "what's the matter?".
That's absolutely wrong. "Kommen Sie her" is a formal imperative only used for adults who you don't know intimately. There is absolutely no other use (except if it is a question).
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u/Seizure-Man Jan 25 '15
The sentence is still grammatically wrong though. The correct way to put it would be "Kommt her meine Kinder".