My grandson and I are renting a cabin the 17th and 18th of July...do we need to bring sheets? If, yes, what size?

Depends on the cabin but we have bunks that are both twins and doubles. Most of the larger beds are queens except for in the camping cabins which are doubles.

Not sure check the web site.

Not sure, i think they are twin sized.

Yes to sheets, I think it is twin size, call them to check