If you're living in the US, contact your State's child support agency.
To apply for child support in this situation, you would typically need to consult with a family law attorney or a child support agency in the country where you and your children reside. They can guide you through the process of initiating a child support case and provide information on any applicable international agreements or protocols between the United States and the United Kingdom that may facilitate the enforcement of child support orders across borders.
Are you asking if your previous husband ought to be legally responsible for supporting your children by your new husband?
the British
No. If your present husband is the father of the children of his previous marriage and is the custodial parent he would have to sue his ex-wife (the children's mother) for support.
the British
No, child support is his responsibility only.
No your new husband can't adopt your children if there dad is active in there life and pays you support. Why would you want to do that?
By fighting
If your children were close with their father you should attend the funeral to be there to support your children.
You're not responsible for your husband's children. He needs to file for a modification of his child support order. However, you should think about marrying a person who is in debt and cannot afford to support his children. He will not have any money to contribute to your mutual living expense or any children you might have with him.
Public support for the French declined, without noticeably increasing support for British-American connections.
Your husband should be paying child support for his children unless the mother of the children has remarried and her new husband adopts the children. It would be wise that he gets each child DNA tested to even be sure they are his children. If your husband did not let you know before you married him that he had four children then it's an injustice to you, but the two of you have to learn to communicate and decide on what the right recourse is to resolve this problem.
British North American Colonies