Would giving liquid to a patient unable to swallow cause their death, and would inheritance be forfeited because of that?

To determine whether or not you were the cause of your father's death, you must consult doctors and explain what happened. They will decide if your action was a cause of death. Based on their decision, the matter of your inheritance will be determined:

If the doctors decide that you were not the cause: You inherit from your father without any issue. If they decide that you were the cause: The ruling on your inheritance in the case of accidental killing is considered, and there are different opinions among the jurists: Hanafis and Shafi'is: Accidental killing prevents inheritance, based on the Prophet's (peace be upon him) saying: "A killer does not inherit." Malikis: The accidental killer inherits from the wealth but not from the blood money (diyya). Hanbalis: Killing that incurs qisas (retaliation), diyya (blood money), or kaffarah (definition) (expiation) prevents inheritance. However, if it is not guaranteed (such as administering medicine or bandaging a wound that led to death), the killer inherits because it resulted from an authorized act. This is the most correct view as it aligns with the general principles.