How do I make an item return to his original position?

So, I'm making another drag and drop game and I've some issues when the object is overlapping another object in the same spot. I've create some global variables that holds the position X and Y before dragging the item, and an ID to differentiate the objects (because they are only one sprite with different animations inside). I need to make the object return to his original position or change position with the other object without overlapping him (the object is named: Nomes in the screenshot below).

rather than use global variables, first set up a family for Nomes (makes checking if one instance is overlapping another instance much easier to handle). Then add instance variables to the family, so each Nomes object can store its own StartX and StartY

I do exactly this in my tutorial on creating a logo quiz. Check it out on my youtube channel:

youtu.be/rDKwhBwf7Ck

hope this helps

cheers!