DH has been contacted by his Ex of 8 years and has been told that her 8 year old DD is his 
He didn't even know she had a DD.
She wants to arrange for him to see his DD as soon as possible and to then set up regular contact - Every other weekend/some time in the holidays. As well as discussing his child maintenance payments.
She supposedly told her DD when she was little that DH was her dad but that he'd gone to live with his new wife (They split up 2 years before we met and we now live at the opposite end of the country to her), then that he didn't want to see her as he now has his own little boy 
So she has had ample opportunity to keep tabs on DH over the years but has never bothered to inform him that he may have a child!?
DH is skeptical as she cheated on him - which is the main reason why he left her. By the sounds of it she would have conceived while they were still together although DH swears he always used protection (we all know that protection sometimes fails) so the child could be his?
What do we do now that we know he may have another child?
If he does, do we have to do all the back and forthing to bring the child to ours and back again since DH was the one to move away? He goes away on business for up to 3 months a year which his Ex has said would have to stop due to their daughters need to be with her father being more important than his work - He wouldn't stop the business trips for DS so I'll be 
if he stops them for his Ex. Are child maintenance (not sure if that is right?) payments calculated on his income or our joint one?
Argh so may questions that I don't have time to ask. Not sure how I feel about him possibly having another child :(
I won't be able to get back online until gone 10 tonight so apologies if anyone replies and I don't get back to them until then