Hmm, I feel so bad reading about your dad. Some people are cheated for their kind hearts. Well, the sister thought she scammed him but she did it to herself, there is a reward for everything we do.
You are right, we should always put our happiness first before any other thing. I see you have a lot of places to visit. I would love to visit Paris someday too.
Our happiness should always come first in life, she cheated him and went away with it, I only feel for him because he was unable to achieve his dream and I learned a lesson through his story.
Try and make yourself happy and fulfill your wishes.