No-one has mentioned wind-blocks, not to block the wind but to clearly demarcate your territory! This is more vital than even a tent.
Given you’re taking a toddler and a baby I would suggest for yourself Valium, Prozac, St John’s Wort or similar so you don’t flip your lid at the constant stream of fellow campers returning very noisily from the pub, waking up said children who only fell asleep five minutes ago. You can send yourself off to sleep (eventually) in the certain knowledge that you’ll get your own back on these rowdy revellers when your two wake up at first light, which I think is about 5am at the moment. 😉
Happy camping!