Freedom of choice

Was asked by friend today to come on an outing on Sunday. "Let's drive to my hometown and see my brother". Yes, sounded like a brilliant idea. If it's not too early. It wasn't. Friend knows me :) But I said, before we agree don't you wanna call your brother to ask if it's all right if we come on Sunday. Friend says "no worries, if he can't make it I have alternatives". I guess it's all right if you have 7 siblings :)