If you own property, vehicles, bank accounts, investments and such in Mexico, it is advisable to make a will, otherwise the Mexican government can become involved in the decision making regarding your estate. A Mexican will can be written as to not revoke your home country will, but rather recognize both. It can be quite challenging for your loved ones to deal with your estate if you do not have a Mexican will.
When you purchase a home, there is an opportunity to add direct line beneficiaries to the deed. At the closing, consider having a will prepared as you will receive a discount.