How do I know if his parents like me?

I just got a new boyfriend on Saturday...I just met his parents and I am afraid that they don't like me.....how do I know if they like me and how can I change their mind about me?

ALWAYS ask if they need help... If they are about to serve dinner, ask if you can help set the table, or bring some of the food to the table. Did you shake their hand when you met them? You need to prove that your mature. And LOTS of thank yous. Try to start and hold a conversation with them. Dont only answer questions, but ask th em in return. Try to fit in with them and participate with family things when your invited. You cant control right now if they like you or not, theres no going back in time to fix that. Just goodluck with future meetings with his parents. Hope I helped!
Jackie