A judge has ordered a 15-year-old Detroit-area girl and her boyfriend to stand trial on accusations they plotted to kill her family.

A judge ruled Thursday that there's enough evidence to try the girl and 23-year-old Michael Rivera in Wayne County Circuit on attempted murder and conspiracy charges. Their next court date is Feb. 12.

The girl is charged as an adult. Her parents said she and Rivera were in a sexual relationship.

The Associated Press isn't naming her or family members because prosecutors have said they may file sex charges against Rivera.

Prosecutors say she stabbed her brother Oct. 17 in their Plymouth Township home. Police say Rivera guided the girl from outside the house, advising her on whether the knife she had was enough to do the job.