He tries. he tries all the time.
Little Frodo Baggins had quite made up his mind.
If his Hobbit-y Uncle Bilbo looked after Frodo and was quite happy in doing so, then Frodo needed to look after his Dwarrow Uncle Thorin. Frodo made sure his Uncle Thorin ate all his greens and silently pointed at the creamed broccoli even after Uncle Thorin announced that he’d end up turning into a Wood-Elf and Mahal help them, what sort of useless Dwarf he’d be if that happened?
Frodo solemnly told his Uncle Thorin that he would never turn into an Elf.
Of course, Uncle Bilbo muttered that it was far likelier that Uncle Thorin would turn into a proper dwobbit instead and yelped when Uncle Thorin caught him up and delivered the Terrible Death by Tickling as a result.
Uncle Thorin was not too fond of Elves. Even though he knew quite a few more Elvish stories than Uncle Bilbo did and even spoke an Elvish language that gave Uncle Bilbo quite a bit of trouble.
(Once upon a time, when Uncle Thorin was a wee badger, he actually liked Elves, so he studied all he could about them, because he hoped he could find a way so that Dwarves and Elves could be friends again. But that was until Mean Old King Thranduil showed his real colors. Uncle Thorin swore Frodo to secrecy on this. It was important to keep one’s promises, after all.)
Now while Uncle Thorin did an excellent job of chasing away the Monsters Under the Bed, was willing to be Frodo’s partner in his Quest to slay dragons (the dragon was the stuffed toy Smaug Uncle Bofur sent for Frodo’s birthday) and fight trolls (the Trolls were carved by Uncle Bifur and were quite splendid), made him sturdy wooden weapons and taught him how to shoot a bow, there were still some things that Frodo’s mighty and heroic Dwarrow Uncle could not do.
Frodo discovered that his Uncle Thorin got lost easily. Sometimes he got lost in the Shire and Uncle Bilbo would fret because he’d miss supper and Frodo was afraid that Uncle Thorin had fallen into the River and the River was a Bad Thing, because it took away Frodo’s Ma and Da and he was very sad for a long time because of that. Sometimes Uncle Thorin would get lost in his own mind and Uncle Bilbo would worry because “my dear Frodo, your Uncle Thorin has led a very hard life and there are hard memories to go with it and they make him sad, sometimes.”
Frodo resolved that he would make sure his Dwarrow Uncle didn’t get lost in the Shire and didn’t get lost in his own head, because he was, just like Cousins Fili and Kili, a very good and very proper nephew and what kind of nephew would he be if he didn’t take care of his Uncles?
And so it was that little Frodo Baggins made sure that Uncle Thorin would always find his way home.