What is the expiation for accidental killing?

Question:
The brother had asked about his father, whose car... meaning he wanted to ask the question again because he said he might not have understood the answer. He says that his father ran over a child who was about two years old. The cause of the accident was that his father had a car. It was parked before he got into the car. He looked under it from all sides. And he did not see anyone. And he got into the car. And during this time, one of the child's brothers placed him under the front tire without his father's knowledge. And when he drove under the child, is he required to fast for two months or not?

Answer:
What was answered is that it is obligatory for him to fast for two months, if the one who caused the accident is the owner of the car, who ran over the child, because if he directly committed the killing, then the blood money is upon him and the expiation is upon him. And the expiation, if a believing slave woman is available and it is facilitated, then if it is not facilitated, it is obligatory for him to fast for two consecutive months, as Allah has explained to you in Surat al-Nisa. It is the one who ran over the child and the one who killed him, so it is upon him, because that one who placed him there in a state of unawareness did not have the intention to kill him. But if a person forces a human being and throws him in front of the car, and the owner of the car runs over him in a state of unawareness, then he is the killer who placed the car in his path. But this one placed him either because he was in the shade, or for other reasons, and Allah decreed that he be on this car, so the one who ran over him is the one upon whom the blood money and the expiation are both incumbent.