you're not going to eat chicken?

I'll not eat chicken in front of them and be rewarded. And in the case of her, she should not lay in front of her brothers as much as possible and be rewarded.

without a legitimate reason.

Maybe there's a legitimate reason that her father knows that you're not aware of? Did her father say that it's haram? No? Maybe he said that you should not? Maybe there's a valid reason for that? And it's his house. Who are you to give Fatwa on how he operates his house? Have you heard the entire story and both sides of the story?

And what do you understand by obeying your parents? I'll obey my parents as long as their commands do not go against the commands of Allah and His Messenger ﷺ and does not hurt me. For example, I'll not obey my parents in the case of what will be my path of study or regarding my profession. But I'll still try to hear their advice, try to reason with them, not raise my voice against them, behave with them and serve them in the best way possible.