Imma save you OP.
Dutchwaregear.comGet the double hammock whoopie hook, and a spreader bar.
You can then hang 2 hammocks under 1 tarp. You each have a hammock, but are right side by side. A spreader bar keeps the heads apart, and the feet end are together.
You would have to have a large tarp, and maybe have tie outs for the tarp to give yourself some room. A tarp like the Warbonnet Cloud burst is made for bridge hammocks, and might fit better since bridge hammocks are naturally wider. You could also get some clip on pull outs to widen your tarp.