Is it permissible to make du'a' for one's parents during the prayer?

The Shaykh : The questioner asks: Is it permissible to make du'a' for one's parents during the prayer? Yes, it is permissible for a person to make du'a' for his parents, for himself, and for other Muslims during the obligatory and voluntary prayers. However, as I mentioned, it is better to stick to the du'a' that has been transmitted. If he wishes to add and make du'a' for whatever he wants, there is no blame on him. He says: I am a person who invested in one of the cement manufacturing factories, and I deposited the amount I invested through the bank, and I received the profit through the bank. What is the ruling on that?