This union was a grave mistake.

A twisted Upper West Side woman allegedly secretly married her mentally ill landlord on his death bed so she could inherit his estate — and then boasted about it.

Barbara Seidel, who rented a room at 574 West End Ave. from Albert Lerner for years, tied the knot with the “incapacitated” 78-year-old shortly before his Feb. 21 death, Albert’s older brother Stefan said in a lawsuit.

Seidel, 63, “not only bragged that she ‘married a dead man’ but also taunted [Stefan] by stating that her marriage with Albert put her ‘ahead’” in the will, he claimed in the Manhattan Supreme Court filing.

A woman allegedly married her landlord while the older man was on his deathbed, according to a lawsuit. J.C. Rice

Albert Lerner suffered with delusions since he was a teenag

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