The kiss on lips by itself has nothing wrong or bad. However, if having sexual nature or causing sexual excitement, then it is not allowed. Accordingly, to be conservative, it is not allowed to have a lip kissing between two sisters or two brothers or a sister and brother or a father and his daughter or a mother and her son. This prohibition is per cultures and all traditions as it is against natural senses and feelings.
Per Islam religion, all kind of sex (including kissing on lips) are allowed only between wife and husband, who are licitly married per religion. Accordingly, all kind of sex (including kissing on lips) are not allowed, for example, between two sisters, two brothers, brother and sister, father and daughter or son, mother and son or daughter, or any close relatives.
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