Teach older ones how to handle matches responsibly. Decorations and candles are a special concern during the holidays. If you buy a live Christmas tree, choose a fresh one and water it daily. With an artificial tree, make sure it's made of flame-retardant materials. Keep candles well away from anything that can burn and blow them out when you leave the room or go to bed.
Fireworks also deserve special mention.
They are illegal in many states and endanger life, limb and property. Avoid amateurs who set off fireworks. Instead, attend public displays conducted by trained pyrotechnicians. Gasoline is a motor fuel only. Keep small quantities in an approved container designed to store gasoline, and store outside, preferably in a locked, detached shed.