16 yr old man sexually assaulted & murdered step sister on a cruise ship.

[JI7]

13. I think it's normal depending on the circumstances. The below comment says she was creeped out by him

in which case she shouldn't have been forced to do this.

But there are many families where step brothers and sisters are just like most normal siblings . They can easily share a room and be safe and any argument will be the usual sibling stuff. But there is nothing to fear. It also depends on how long they knew each other. My example is cases where they have known each other for some time.