Eh who cares if you lied lol, it's just some lady trying to sell you something dumb. If anything she would probably take advantage of your pop's lack of English and convince him to buy something he doesn't need. Your sister sounds like she's making a big deal out of absolutely nothing, I don't think you lied and I don't think you should be upset if you did, I lie to those annoying door to door sales people all the time.