HARRY
I know. But the thing that scares me most, Albus Severus Potter, is being a dad to you. Because I’m operating without wires here. Most people at least have a dad to base themselves on – and either try to be or try not to be. I’ve got nothing – or very little. So I’m learning, okay? And I’m going to try with everything I’ve got – to be a good dad for you.

ALBUS
And I’ll try and be a better son.

Harry Potter and the Cursed Child - Chapter 4 :
See this quote in the Pensive -