Is it permissible to buy a car with money from a deceased father, after the questioner had asked him for it before his death and he did not respond, knowing that the father had given cars, marriage dowries, and apartments to the questioner's siblings, but did not give him anything?

The money you took was not given to you by your father as a gift, and his silence is closer to a rejection. Therefore, you must return it to be divided among the heirs. What your father gave to your brothers, if they took possession of it during his lifetime, then it is theirs; otherwise, the gift is void and must be returned to the estate. There is nothing wrong with the gift of a dowry to someone who got married, as it has a legitimate religious justification. As for the gift of the house and the car, it is an unjust gift, but it becomes effective upon the father's death before he could revoke it, and it is recommended for the recipient to return it.