This question needs a bit more detail in order to answer it really well. First of all, I'll guess that the parents are yours, not your in-laws. It would also help to know how old you and your parents are, and exactly what they are doing that is causing problems. So until I know this I can only give a general answer:

You could start by writing down examples of your parents' difficult behaviour. Then write down what you want to achieve that is being prevented by their stubbornness. After that, you could ask yourself 1) is their behaviour really stubborn? or is it also possible that you are expecting too much of them? and 2) what compromises or other actions could be taken so that everyone is happy? Generally, when one person accuses the other of being stubborn, there is room for movement on both sides!

I hope this is some help; if you like to ask another question with more details, I'm sure you will get a more exact answer.