You can use the following method to make a tea tree oil bug repellent for your children.
2 ounces boiled or distilled water
1.5 ounces vodka or witch hazel
15 drops of tea tree essential oil
25-30 drops of citronella essential oil
25-30 drops of peppermint essential oil
Fill a clean spray bottle with the ingredients listed above. Shake the bottle well and store it away from direct sunlight and your child’s reach. Spray it on their clothes every two hours. Be careful not to spray it into their eyes, mucous membranes, or open wounds.