Online Will writing services are generally not suitable for Muslims because they might contradict Muslim’s Shariah and or Faraid laws.
It can be quite complex regarding Muslim asset distribution, and we refrain from providing specific advice. Several factors come into play, including the client's gender, the applicable school of Muslim law, and the potential male and female beneficiaries as outlined in the Family Relationship Chart.
You can refer to this online calculator for details: https://syariahcourt.gov.sg/Inheritance/Online-Trial-inheritance-Calculator
It is best to consult a lawyer knowledgeable in Muslim law or estate planning.