What is the ruling on taking money from a brother without his knowledge to meet a need, and what are the Islamic and psychological implications of this, especially with the mother's knowledge and approval, and the questioner's desire to return the money in the future?

Theft is a major sin that necessitates repentance. Your need for university expenses does not permit you to steal from your brother's money. Your father's negligence and your mother's consent do not justify this forbidden act. Therefore, you must repent immediately and return what you took to your brother, by any means possible when you are able, or seek his forgiveness. The restitution should not be in the form of a gift, but by returning the money itself, even if it is presented as a gift. And know that financing with unlawful gains is one of the impediments to the acceptance of supplications.