This looks pretty big https://www.hammockdream.com/shop/family-hammocks/ but not sure if big enough as a family hammock. As someone said, you could try to join 2 together, just make sure someone doesn't fall off probably there should be some really extra large hammock for families, but I guess they are not popular, as I have never seen one.
Would be good if you can paste a link, if you find it.
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