Family Affair isn't exactly what I call nice...in fact, we left before our stay was up. Sara's isn't bad...it's right across from Waldameer Park (amusement park) and the entrance to Preseque Isle State Park...a lot of seasonal campers...plus a lot of traffic in general. You might want to try the Erie Koa...we stayed there and it was really nice or you might want to try Virginia's Beach Campground...it sits right on Lake Erie about 15 minutes from the heart of Erie, but it's a beautiful campground.
But, our favorite campground, and we're tent campers as well, is about an hour south of Erie is Pymatuning State Park...it's absolutely beautiful...there are over 600 sites divided between 3 campgrounds within Pymatuning...Jamestown is our favorite...they have their own in park beach..all the sites are spacious. And, hey, at only 12.00 a night during the week it can't be beat price wise...$14.00 per night if you want electric.
Here are three URL's for the campgrounds I mentioned...Hope they help you out...and when you're in Erie...go to the Zoo....it's one of the best small town zoos I've ever been to.
Virginia's Beach Campground...North Springfield, PA http://www.virginiasbeach.com
Erie KOA http://www.koa.com/where/PA/38112.htm
Pymatuning State Park http://www.dcnr.state.pa.us/stateparks/parks/pymatuning.aspx
Hope you enjoy your visit and if you have any other questions let me know...I've been to Erie many times!!!