B.M.
Yes, although I wouldn't say it is so much guilt, as just wanting them to be happy. I think that is completely normal for people who have good relationships with their parents. With anyone for that matter. It's human nature to want the best for those you care about and when things are going badly, I think most people would worry some.
They key is not letting worry take over your life and keep you from focusing on your immediate family.
My parents are currently experiencing some financial difficulties, while my husband and I are comfortable at the moment, which is a blessing in this economy! I worry about the stress this places on my parents and do whatever I can to help them (when they'll allow - which is RARE). I want them to be happy and as stress free as they possibly can and it bothers me to know they are struggling. But...I wouldn't say that I feel guilty in any way, just sad for what they are going through.