The "Castle Doctrine" in Texas refers to a legal principle that allows individuals to use force, including deadly force, to protect themselves against intruders in their home, vehicle, or workplace. This law is based on the idea that a person has the right to defend their "castle" from unlawful entry.

Key points of the Texas Castle Doctrine include:

1. **Use of Force**: Individuals can use force to protect themselves against an intruder, and in certain circumstances, they can use deadly force if they believe it is necessary to prevent imminent harm or death.

2. **No Duty to Retreat**: Under this doctrine, a person does not have a duty to retreat before using force if they are in a place where they have the right to be, such as their home.

3. **Presumption of Reasonableness**: Texas law provides a presumption that a person acted reasonably in using force against an intruder if they are protecting their home, vehicle, or workplace.

4. **Limitations**: The law does not protect individuals who provoke the situation or use excessive force that is not deemed necessary.

The family was at their home.