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I am afraid that if the Deeds to the house were transferred to your brother in 1995, the legal ownership of the house passed to him at that time. Despite your Mother's wishes for the property to pass equally between the 2 of you, unfortunately as she is/was no longer the legal owner of the property, her wish had no legal standing.
Unless you can prove your brother in some way obtained the proerty by fraudulent means back in 1995 or by exerting undue influence on your Mother,
there is nothing you can do to make a claim against it.
I am sorry this is not the answer you were looking for, but it sets out the legal position.