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DUNCAN -- A mother who once married her son and later her daughter is going to prison for incest.

Patricia Ann Spann, 45, of Norman, must register as a sex offender after her release.

She pleaded guilty Tuesday to the felony offense, admitting she and her biological daughter married in Lawton and lived together in Duncan.

Their wedding in March 2016 came a little more than 17 months after same-sex marriages became legal in Oklahoma.

Under a plea deal, Patricia Spann was sentenced to two years in prison and eight years on probation. She also was fined $1,500 and ordered to pay $300 to the state victims' compensation fund and $991 in fees.

Duncan police found out about the marriage from a worker with the Department of Human Services. The worker discovered the incestuous relationship during the course of a child welfare investigation, police reported in a court affidavit.

Both the mother and daughter were charged in Stephens County District Court in September 2016. The incest case against the daughter, Misty Velvet Dawn Spann, 26, is set for a plea next week.

Their marriage was annulled last October after a judge concluded the mother had induced her daughter "by fraud to enter the marriage."

In her request for the annulment, Misty Spann complained her mother claimed to have "consulted with three separate attorneys who advised there would be no problems with the marriage."

The mother told the DHS worker she "had looked into it" and felt no laws had been violated "because her name was no longer listed on Misty's birth certificate," police reported.

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The mother explained to the DHS worker that she had lost custody of her daughter and two sons years ago, police reported. She said she and Misty "hit it off" after being reunited in 2014.

Misty Spann pleaded guilty in November to her incest charge. She was sentenced to probation for 10 years and required to get counseling.

However, after the sentencing, a legal technicality was discovered that prohibited the agreed upon type of probation -- a deferred sentence -- in an incest case. Because of that legal issue, she was allowed to withdraw her guilty plea.

Police discovered during the investigation of the mother-daughter marriage that Patricia Spann also married a son in 2008 in Lawton, according to the court affidavit. The son was 18 at the time. A judge annulled that marriage in 2010, at the son's request, on incest grounds.

No charges resulted from that marriage.