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A Florida woman has been charged with incest after she gave birth to her brother’s severely ill baby.

Pauline Martin, 33, admitted to officers that she had been in a sexual relationship with her sibling for five years.

The baby was born with severe medical problems in a hospital in Leesburg last November. The newborn was transferred to Winnie Palmer Hospital for Children in Orlando.

Doctors called police in after tests revealed the close genetic similarities between the two parents.

It also emerged Martin had failed to fill in the father’s name on the birth certificate or on health insurance forms.

She was questioned by police at the McDonald’s where she works in Leesburg and admitted she had had sex with her brother as recently as last Wednesday.

“She said she was going to end her relationship with her brother because she knows it is wrong,” the police report stated.

Deputies said she tried to run out of the restaurant at one point and later shouted "f*** this!" and kicked out while being transported in a police car.

Martin was arrested on charges of incest and resisting without violence. She is next scheduled to appear in court on April 16.

Police are also attempting to track down her brother for questioning.