What father is to son stumbling into a bordello? (5,8)

I believe the answer is:

blood relation

I'm a little stuck... Click here to teach me more about this clue!

'what father is to son' is the definition.
I can't judge whether this defines the answer.

'stumbling into a bordello?' is the wordplay.
'stumbling' indicates anagramming the letters.
'into'+'a'+'bordello'='intoabordello'
'intoabordello' is an anagram of 'BLOOD RELATION'.

Can you help me to learn more?

(Another definition for blood relation that I've seen is " Relative by birth".)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.