Family Immigration - Sister

In general you can't bring your siblings with family reunification unless there is very special reasons :for example if they are very sick and there is no one to take care of them in their home country etc.

@Rridik Thanks for the insight. I saw this on UDI site, "It is very difficult for other types of family members to be granted family immigration. You can only be granted family immigration if UDI believes that strong humanitarian considerations apply in your case. We make a specific assessment of this in every individual case, so we cannot say anything in general about what is required for other family members to be granted family immigration."

I don't know what may meet "strong humanitarian considerations".  In my situation, my sister lives alone with no immediate family members remaining, as both of our parents are deceased.