Magnetic pieces being attached to each other and moving together ???

Hello ladies and gentlemen. I'm trying to make a magnet system where there are pieces with two colors, blue and red. Opposite colors pull each other and different colors push each other back. Exactly like a magnet. I'm doing Overlap.sphere on each piece to check pieces that are close and then check their color, after this I just add a normal movement function (I tried "addforce", "transform.translate", "moveposition"). It works just fine, but my problem is when two different colors "connect"/"attach" to each other AND if other piece passes by and attracts one of them, they both need to move (Ex: There are two pieces Red and Blue connected, another blue piece comes by and it's attracted by the red piece -> The entire connection(The initial blue and red pieces) are pulled to the new blue piece). I don't need an entire pre-made script, but if you do it the better. I just need a light, some guidance. With the system and checking I'm doing, it's really hard to make it work. I'm studying the use of Joints but it is still very clunky. Any tips?