If your husband was not faithful to you (think an ongoing affair that has continued even after finding out about it) would you remain living with them and stay married, if the alternative was leaving them for a much lower quality of life for you and your DC's and onto benefits in a smaller house in not such a nice area? Would you stay if it meant your DC's were much better off? What if it meant you couldn't work because you'd have to look after them all day because nurseries/schools are shut? What would you do? I went ahead with the marriage (marriage of convenience for me not that he'd know) so I would leave with at least something. Yes they're his biological children.