New home

Hi I live in a Wendy house with my 3 kids now for over 8 years and it's is leaking and water is coming in from underneath as we don't have a solid floor I really need help it is so cold our mat is wet and has a bad smell from getting wet it has even started leaking on our bed my worry is for my kids that will get ill so if anybody can help us in any way I would be so grateful I'm willing to work as I'm unemployed and times are tough so please open your hearts thank you.