You can't just accept something you haven't read or pre agreed.

It could just be the papers. In this case then it will just outline the details of the divorce and what he proposes as a 'split' of assets etc which will include the property and equity depending on how much is left on the mortgage and the current selling value of the property.

If you have children and you are the main care provider then any split will always go in your favour.

My advice, see if you can get some free legal advice first and take it from there.

If you are in the UK then CAB are great and offer a few meetings with local solicitors to talk it through