I just looked them up on Wikipedia. Good to know they are not a human threat and do not carry disease, just a pest.
From Wiki: Silverfish consume matter that contains polysaccharides, such as starches and dextrin in adhesives.[2] These include glue, book bindings, paper, photos, sugar, coffee, hair, carpet, clothing and dandruff. Silverfish can also cause damage to tapestries. Other substances that may be eaten include cotton, linen, silk and synthetic fibres, and dead insects or even its own exuvia (moulted exoskeleton). During famine, a silverfish may even attack leatherware and synthetic fabrics. Silverfish can live for a year or more without eating.[2][6]
As well, they lay their eggs in small cracks. You may want to get on the hands and knees and vacuum all the smaller areas. Eggs hatch within 2 weeks.
Look them up and get their family name. From there you should be able to find something at the hardware store that gets rid of them, although I am sure not child friendly.