Is it permissible for me to kill my half-siblings and their children after they conspired against me and stole my share and my sister’s share of my father’s inheritance?

It is forbidden to kill a Muslim who defrauded the questioner and took his share of the inheritance; for the blood of a Muslim is not permissible [to shed] except for one of three [reasons]: the married फॉरnicator, a life for a life, and one who abandons his religion and separates from the community. Allah Almighty has warned that whoever intentionally kills a believer will be in Hell, abiding therein, and will incur His wrath, His curse, and a great torment.