Do I have to make my sister the ceo if she helped build my company? I don't think that I want to.
What would be the reason to tell her no?
I don't feel comfortable giving it to her, I interviewed several people and found new guy better
If you found someone that fits the role better, then I say go for it. She should not be expecting it just because she is your sister.
I'm not really happy with the new guy decision, I want her to be aware of my reasoning so I'm going to tell her.
That is good, and I am glad that you're willing to speak with her about the possibility of giving it to someone else. She needs to still earn the CEO all the same as anyone else, so having this conversation would be a good thing to have.