My son and DIL have agreed to divorce after a short marriage. There are no children. They own a house and have agreed how the proceeds will be divided. My son will be buying another property immediately, my DIL wishes to wait a while. The house sale is now underway. There has been no formal separation documentation signed and they wish to start divorce proceedings only once the house is sold which they will do online. They made a mirror will leaving everything to each other. At what point can they change their wills so that each of them can leave their share of their property to their own families? Neither now wish to leave the other anything in the event of one of them dying, but jointly owning the house, life assurances and in the absence of any separation documentation, or a new will, this is what would happen. Should they have an interim separation agreement drawn up? How and when can they separate the house ownership to a joint tenancy and split the life assurance or can new wills stating they are separated cover this?