Tactics book recommendation needed

I'm looking for recommendations for intermediate to advanced level tactics book. Of course, Lichess itself has great tactics section for practice. But I'm looking for a physical book that I could use to work with my son. His Lichess tactics rating is around 2300+. So looking for some advanced level books that could help him improve his current level preferably a book that has positional tactics or tactics that are thematically presented. Thanks.

If your son is very good in tactics, he should study Chess Informants Encyclopedia of Chess Combination or Great Book of Chess Combination.

Just download positions of famous games, no need to buy books. For example games by Judith Polgar. Those tactics are the real sh?1 for the whole family.

Download auerswald.pgn. There are 2000+ puzzles.

Check this:

http://www.gambitbooks.com/pdfs/1001DeadlyCheckmates_UK.pdf

or that

http://www.gambitbooks.com/books/A_Course_in_Chess_Tactics.html

This one
everymanchess.com/products/stein-move-by-move

or Tal's books give good inspiration for tactical play and the positional basis. They are game collections teaching combinational play.

lichess.org/training

Biggest book that has 1.25 million free puzzles.

I would strongly recommend a book called "encyclopedia of chess middlegames" its my bible when it comes to tactics,
Its made by informator, Beograd.
It divides/break down tactics in to themes and its just a masterpiece..where ever i go this book goes with me.
Regards Richard

@ryan121 thanks. The book looks interesting. Will give it a try. Btw, what's auerswald? Is this an app or software containing puzzles?

@WinOr10PushUps yes I would love to do that. Unfortunately, I'm not much of a chess player myself and my 9 year old is unable to figure out
Some of the moves in the GM games. So we end up getting stuck when we try game analysis. Thanks for the reco though.

@Pawnstructures thanks for the recommendation, Richard. Will definitely try that out.