Ah, nope! Spoilers below!
To get to the true ending, you must find a hidden item called "Worn Paper' hidden at the start of the game. From there, shows a location of "items" that'll lead you to the truth for the skeletons. You must make sure to interact with these "items" before talking to the skeletons, as a new option will be given to you if done as noted! From there, the steps become linear after!