2 notes on bedding :
Hammocks : overrated. A very very small percent of the population has converted to them and they all think it's be best thing ever. But they are a pain to set up, you have to search for the perfect spaced trees, and they will never be as rain-proof as a tent (regardless of the early silly post saying tents always get wet, which is just untrue). I'm convinced that hammock folk (hangers) think they are cool because they are different, which just isn't always the case. You also have to become a knot expert, and would have to set up a hammock for every person instead of just throwing some bags/pads into a tent. It's just awful advice to get a hammock for a family campout (or ever really).
Sleeping bags : Mine is rated for 45 degrees and it's hot during the fall. I've used it to camp in sub-40s temperatures backpacking and it's fine. If it gets colder, I add a fleece or some under-armor. If the low is 60, you probably won't get cold regardless of sleeping bag, but you sure won't get cold with a 40-degree bag. If you get a bag rated for 30-degrees, you will likely never zip it up if you are camping in the fall, unless you live in Montana. It's going to be more bulky and more expensive and not necessary.
Pro tip : If you do get cold, put up the rainfly. It really does keep in the body-heat, can make a 10-degree difference usually.
