YOU SAID:
i like my sister, she's okay
INTO JAPANESE
私は妹が好きです、彼女は大丈夫です
BACK INTO ENGLISH
i like my sister she is ok
INTO JAPANESE
私は私の妹が好きです、彼女は大丈夫です
BACK INTO ENGLISH
i like my sister she is ok
That didn't even make that much sense in English.