YOU SAID:

I have come to get your children

INTO JAPANESE

私はあなたの子供を取りに来ました

BACK INTO ENGLISH

I've come to get your child.

INTO JAPANESE

私はあなたの子供を取りに来た。

BACK INTO ENGLISH

I came to get your child.

INTO JAPANESE

子供を連れて来たんだ

BACK INTO ENGLISH

I brought you a kid.

INTO JAPANESE

子供を連れてきた

BACK INTO ENGLISH

I brought you a kid.