Children can be noisy and distracting to someone interested in looking at a home. There's nothing that improves the value of a home for a lower cost than a fresh coat of paint. And it's often easier to paint a room than it is to scrub it. Be sure to avoid black, violet and pink. Keep noise down.
Silence is a restful sound that offends no one.
Turn off the TV and radio. Soft, instrumental music is fine, but avoid vocals. If necessary, close the windows to eliminate any street noise. Fix squeaky floorboards. Don't run any noisy equipment like a vacuum cleaner or table saw while people are looking at your home, and, if possible, ask your neighbors to avoid irksome noises.