The way I had my haunt set up last year was that I had a more child friendly haunt with lights and a few tombstones.

Then more towards the back was my cemetary with music and the whole nine. I always warned parents that that area might be too scary for their toddler TOT's. At that point it was the parent's decision wether to bring their child to view it or not.

I also had to tell certain TOT'S to not walk on my front yard. The last thing I wanted was one to trip on the many extention cords we had.