this is a short book that'll be you have a child/children with someone from the wanted but your dating some one from one direction I'll do the pairings below
you have a child or children with Nathan but your dating Louis
you have a child or children with Siva but your dating zayn
you have a child or children with max but your dating liam
you have a child or children with tom but your dating niall
you have a child or children with jay but your dating harry
these our my own ideas if you have a suggestion comment and I'll write it