How do swap the members of the same family?

So, I'm making a game in which there is a grid of 3x3 and the user needs to create a route by swapping sprites which lead to the objective. But the question is how can I swap the sprites as the they all are the members of the same family? I've tried the picking up the sprite by overlapping of the mouse coordinates but how can I swap them, storing the variables in temporary global variables and then setting the position of the sprite should be there, but I need to do it using family else there would be so much of events just for swapping. Any help would be appreciated?

Like:

on family drop:

is overlapping same family:

pick instance overlapping mouse.x and y: set glob var x to overlapping sprite.x

set glob var y to overlapping sprite.y

set position of dragged sprite to temp x and y

set position of overlapped sprite to var x and y.

Refinements would be appreciated.

You can do like this example: dropbox.com/s/7cwh6xxz6ms9epw/match_by_swap.capx

You can do like this example: dropbox.com/s/7cwh6xxz6ms9epw/match_by_swap.capx

Thanks for the file but there's no family. Need to get the family's members for that.

The logic still applies. But consider to understand first how to use family to pick one object between them in certain condition to distinguish which one should do a thing.