Separation matters relate to estate matters given that, typically, each party will prefer for their former spouse not to have any right to the other’s estate any longer. If that is your wish, it is wise to ensure a term regarding this is specifically set out in your Separation Agreement. Beneficiary designations should also be changed, along with your Will so that everything is congruent unless there is a specific reason for changing one and not the other, which should also be specifically set out so as not to confuse an objective party interpreting the document.
If you do not have a Will, it is also helpful to have one drafted at this point, to clarify what your intentions are moving forward, in the context of operating as a newly single person/parent, or especially if you have re-partnered.
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