I agree with HipHop! I volunteer at a rescue, and we recommend 50 sq ft of exericise space, and you are only a tiny bit under that (plus your buns are pretty small), so I would say given the tough situation you are doing great. Adorable bunnies btw. 🙂
I think having 11 ft to run in one direction is really nice, so they can get up to full speed for those zoomies. 🙂
If you really want to give them more space and interesting places to explore, you could try building up part of there area into a NIC cube condo, so they have some levels to explore.
Rather than “illegally” let them out and risk making your situation harder, you might slowly start pointing out to your parents that the bunnies aren’t chewing the carpet in their pen, aren’t peeing on the floor, aren’t chewing the furniture, etc. Once the see that their are well behaved and not likely to cause any damage or messes, maybe eventually they will agree to some supervised free-roam time.
But don’t stress. I think the most important thing would be to still spend plenty of time with them.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.