Hey
During the refugee status determination(RSD) hearing(interview) you need to talk about your family and their whereabouts.There is no problem for them visiting you.Are(were) they recognise refugees?If so, and you all fled for the same reasons, you should apply for family reunification.Both Canada and US refugee offices will work on a way to reunite you.If they are(were) not recognised refugees, then you can include them in your file and they will become refugees automatically when you do. The only thing to worry about is to prove to the office that you have a well founded fear of persecution in your home Country.Hope this helps a bit?