Send the kids' to gramma's and then, investigate the apartment and the possibilities.

You really should find those beams. Your options will improve greatly if you find one solid beam.

Then, as we have done, there are two hook eyes that have been screwed into the beams. They are industrial strength, but we have told the kids they are plant hangers.

From there, you can fashion a spreader bar with hook eyes near each end and one in the middle for suspending the bar from the cieling beam. Using a sturdy wooden dowel from the hardware store, or strong 2x4 or 4x4, would be divine.

Those are just my thoughts. Good luck to you.

Val