Q: My friend came to my house during Ramadhan. He was not fasting due to some illness. Should I offer him food or not because it was Ramadhan?
A: You should not offer food. You do not only need to fast, but you also need to respect the fasting person and to openly break the law of Allah Ta`ala is really an invitation to His wrath and anger.
And Allah Ta’ala (الله تعالى) knows best.