Word help - what is a good adjective for son?

Factual Questions
1

Or maybe I mean adverb…e.g.

Let me give you some fatherly advice, son.

Thanks, old timer. Now let me give you some sonly (?) advice.

Is there a better way of saying this? Don’t think I’ve ever heard anyone use the word sonly IRL.

2

Filial

3

And fatherly (like filial) is an adjective, which is what you want. While most words ending in “-ly” are adverbs, there are a number of adjectives that end that way: lovely, goodly, princely, etc.

4

Little Man

5

Thanks guys - filial is exactly the word I was searching for.

6

But I think the corresponding adverb to filial would be paternal. Both have a more formal connotation than ‘fatherly’. So I don’t think there is a word that exactly matches what the OP wants. Sonly, as he said, would seem to be the closest, but that isn’t really a word.

7

Sonly is a perfectly cromulent word. And avuncular means “like an uncle,” IIRC.

8

'Sonly rock and roll, but I like it…