If the divorce was ex-party, then probably there was no settlement for his ex-wife and their children at the time. She can now claim maintenance for herself and her kids, if she is not able to support herself and her kids. Legally she can claim maintenance from her ex-husband till she is married again. As far as the children are concerned, they are still your husband’s responsibility to maintain. From your post, it seems there is no contact between your husband and his earlier children either. Sad, very sad.