Who has children living overseas?

My kids live overseas with the evil ex. They are cut off from me (long story). How do you cope as a cut off mum/dad? Should I tell them that they'll be having a sibling or just let that be after all they won't get the message & I don't know when they'll come home to me... I just hope they'll be able to adjust with the new family dynamics when they return one day. 99 - depressed mum of 2 abducted teenage children.