Agreement to Make joint or mutual wills.

H and W are husband and wife and are the owners in joint tenancy of _________ and the parties also hold and have agreed to hold as joint owners all other property which they now own or may later acquire while both parties are living, so that upon the death of one their entire estate becomes the sole and exclusive property of the survivor, and the parties are now _________ years of age and are uncertain as to who shall be the survivor and have considered the ultimate disposition of their joint property after the death of the survivor, and have mutually agreed to a joint disposition of their properties, effective upon the death of the survivor, to _________[e.g., children of the parties], as specified: