To whom does the ownership belong for the land that the questioner contributed to purchasing with half the amount from his own money, which was designated for marriage, while his brother paid the other half from his father's money, which the questioner had also deposited into his father's account for the purpose of marriage?

Regarding the land, one should refer to the agreement made at the time of its purchase. If it was agreed that it was a gift to your father, then it belongs to him. If it was agreed that it was equally shared between you and your brother, then it is to be divided equally between you. As for the money you deposited into your father's account for the purpose of marriage, you have the right to claim it back, because your father encroached upon it, and he has no right to take it, given your need for it, the harm it causes you, and his giving it to your brother. This should be claimed wisely. The land has no connection to the encroachment upon this sum of money.