Willy
If you are actually in that situation, then go talk to the welfare department and they will clear out all your questions and concerns, they will have all the answers for you.
If you not with QR, then don't worry about until you are in that situation! Live your life stress free as there are many more important things to think about other than staff travel benefits when you are leaving the company, and if your brothers, sisters, parents, in-laws can't travel because you are making a life changing decision, they should understand.
Hope your ask your questions to the right person/department instead of on a forum like this!
Good luck