That does suck. I just imagine how dreary and back breaking that work was. And its not that the work is bad or that you didnt mind doing it, its the fact it happens on a day you expect to be able to kick back and relax.
Im the same way. I have no problem getting dirty, helping out and so on, but it just gets under my skin to have a day, that I planned on taking to relax and enjoy the time, ruined by stuff like that. But what can you do, its your parents.