In dreams, if you are disinherited then you will feel a deep disconnection from yourself, from your environment, from society or even leave society itself for good due to lost status or hurtful abandonment by the ones near and dear to you. Dreaming about being disinherited is something that happens more often if you happen to have anxiety as well.
We should however note the symbolic meaning of disinherited in dreams, deliberately translated as abandonment. The dream suggests that the subject may feel destitute and powerless. Furthermore, it could mean that someone near them has been abandoned by another person or vice versa and they feel to be cast aside because of this event. It can also show a recent public event that has caused a change in society due to abdication (death), rejection (relationship) or disloyalty/betrayal to promise obligations (employment).