Move more then one object from the same position

Jimmy

Hello there!

In my school project, I am working with test tubes (60 pc.) with their taps. I would like to attach a tube and a tap to the gripper, move them to the opener's position, rotate the tap then detach the test tube model from the gripper.
The problem started when I decided to make it universal (not to call them by their names rather attach "the closest one"). If I add both of them to the same signal it works, but I have to use their names ttube1, tap1-it isn't a universal option.
Is there any way to attach more than one object to the gripper without calling them by their names?

If import all of those test tubes with taps, their name will be the same but their ID isn't, so in the choose which model want to attach I will have 64 models with the same name.

Thank you in advance!