What in the world I do wrong?

So this morning I called dad and he's admitted to hospital so he asking about my children. I told him that eldest son has to go tuition today, but youngest son is on school holiday.

Son's tuition today will end around 6pm as he starts to go playground at 4.30pm, this is their school holiday plan at tuition. Just for today as tomorrow the tuition centre is at rest.

So dad has to go laser his left eye today and on next Thursday to laser his right eye. So I told him that I am visit him when I am free, he told me no need! That's so sad to hear this words from him. :(

Why I can't visit him or worry about him? He's my dad.