You should have valid wills in place - the fact that you have children and property make this a matter of necessity. I strongly advise this as a priority. If money is tight look in your local paper (usually in Autumn} to find "Free" will-making by certain solicitors. The service is completely free, but you do make a contribution to a charity of their choice, (usually �50 each) We have done it successfully.
Always,always, have a joint repayment mortgage. This is an absolute must: you are married today, but tomorrow....? We all know that tomorrow never comes, but where finance is concerned belt AND braces, please!!