EXPLORING THE BASICS
It is prescribed that when death approaches any of you - if they leave something of value - a will should be made in favor of parents and immediate family with fairness. [This is] an obligation on those who are mindful [of Allah].
AL Qur'an 2:180
From the Islamic perspective, the importance of leaving a lawfully valid Will cannot be overstated. It is the duty upon every Muslim to leave their wealth and estate in accordance with Allah's commandment in the Holy Qur'an.
...BUT MY FAMILY WILL DIVIDE UP MY PROPERTY, RIGHT?
Not necessarily. While many Muslim families find it easier to ensure all proper burial rights; it is a misconception that families will have total control over their loved-ones estates when there is no Will. In actuality, the state (in the absence of a Will) may enforce a default order of distribution for all of a persons property. This order of distribution may not always align with Islamic principles.
FUNDAMENTALS OF ISLAMIC WILLS
In what ye leave, their share is a fourth, if ye leave no child, but if ye leave a child, they get an eighth; after payment of legacies and debts...
AL Qur'an 4:12
DISTRIBUTION OF THE ESTATE
The Prophet, may the mercy and blessings of Allah be upon him, advised one of his companions to bequeth 1/3 of his estate as a gift, saying "It is better to leave them rich rather than poor and destitute."
Saheeh Al- Bukhari