Are people truly capable of changing?

I ask myself this question because my sister’s husband, whom I never liked, is all of a sudden a decent human being. My sister has been married for almost 13 years and I have never liked the guy. He has always been inattentive and condescending. I normally only see him once a year during the holidays and over the years he has been changing. This year when they showed up at my house for Christmas he seems like a completely different person.
My sister had surgery two weeks ago and is not able to walk. Right now she is constrained to a wheel chair and to a recliner. Throughout this whole ordeal he has been very attentive towards her, making sure she eats the right kinds of food, gives her a bath every day, and takes care of her wound. Not only that, he feeds and makes sure the kids are doing what they are suppose to do and cleans house.
How does someone go from being a total and complete jerk a few years ago to this?

Are people truly capable of change or is this change temporary?

Fire!!!!

I was driving to work this morning and I saw smoke coming from the general direction where I work and at that very instant I wished it was my office building that was burning so that I didn't have to go in to work today.
It was then that I realized I need a new job or a new position.