A mother from Texas who was attempting to medically transition her seven-year-old son into a girl has lost a court case.

Dr. Anne Georgulas, who is the mother of James Younger, originally won her previous court case last October that allow her to give him hormones that block puberty.

But the decision by the jury meant the boy's father, Jeff Younger, who opposed such a procedure, had absolutely no say in his son's medical decisions.

Now that ruling has been overturned after Dallas Judge Mary Brown ruled on Thursday that both parents should have joint conservatorship over their child which would mean all decisions would have to be agreed upon by both parents.

Jeff Younger has been battling his ex-wife Dr Anne Georgulas in a Dallas family court as part of their bitter custody fight over whether their child James has gender dysphoria

Jeff Younger is pictured outside court in October. A judge has ruled that he will be allowed to have a say in future medical decisions related to his child

Georgulas's attorney has since promised to challenge the judge's ruling.

Thursday's ruling means Georgulas and Younger will have to make joint medical decisions regarding their child, which includes whether James should undergo hormone replacement therapy to transition to a girl.

They will also have to jointly agree on haircuts for the child, as well as dental and psychiatric care.

Jeff Younger has never believed James has gender dysphoria and has long accused his ex-wife of forcing their child to socially transition into a girl by making James wear dresses

Dr. Anne Georgulas, who is a pediatrician, has argued that James is transgender and should be able to wear dresses and attend school as a girl named Luna

Younger and Georgulas will also be forced to go to counseling.

The decision comes after a jury ruled in October last year in favor of giving sole managing guardianship of James and twin brother Jude to their mother.

Georgulas, who is a pediatrician, had long argued that James is transgender and wanted her child to transition to a girl named Luna.

Her ex-husband, however, did not believe James has gender dysphoria and that his child was just experiencing some confusion with gender.

He accused Georgulas of forcing James to socially transition into a girl by making the child wear dresses.

In November it was revealed the youngster had decided to attend school this year as a boy.

In a post from the Facebook page 'Save James,' pictures of James dressed in a button down shirt, slacks and tennis shoes were shared online.

The caption read: 'Going to school. This is what it looks like when JAMES gets to choose! *Affirm this! * Also, a photo taken yesterday, just before church. James and Jude proud to be men! Save James, save thousands of children!'

The bitter court battle began when Georgulas filed a court request in 2018 to change their joint custody arrangement to include a requirement that Younger start calling their child by the name Luna.

She claimed three mental health professionals had diagnosed James with gender dysphoria and that therapists had recommended they start using the name Luna instead of James.

Younger, however, filed his own request with the court to obtain sole custody of the twins to prevent the gender transition. Initially, he lost, but Thursday's ruling now sees him on an equal footing with his ex-wife over their son's welfare.

James Younger (pictured) has been attending school this year as a boy since November after a bitter custody battle ensued between James' parents over gender identity

The couple went through IVF to have twins and requested their gender be male before they were born in 2012. James is pictured, right, along with his twin brother Jude, left

In recent photos posted to the 'Save James' Facebook group, James no longer wears dresses

James appears to have been enjoying playing outside with his twin brother Jude, left

Georgulas and Younger married back in 2010 when they were members of the Orthodox Church.

They went through IVF to have twins and requested their gender be male before they were born in 2012.

The couple annulled their marriage several years later.

But the arguments over their child's gender began when Georgulas took James to see a gender therapist at the Children's Hospital Center.

She claims she had noticed James requesting girl-themed toys, that the child was imitating female Disney characters and had been asking to wear dresses.

The therapist recommended James start social transitioning by wearing dresses to school and going by the name Luna.

Younger claims his ex-wife had been forcing the transition ever since their divorce and has accused Georgulas of starting to manipulate their child when James was just three years old accusing her of locking their son in the bedroom and telling their child that 'monsters only eat boys'.

Younger also claims Georgulas had been forcing the child to wear dresses.

Younger went on to publicly accuse his ex-wife of sexually abusing their child.

Younger (right) claims that when James was with him, he did not want to dress as a girl at his house and claimed that his ex-wife was forcing the child to socially transition

James, left, along with his dad, Jeff and brother Jude, right. The trio got to spend a lot of time with one another during the Christmas holidays

Recent pictures show James to be a happy and healthy seven-year-old boy

'I want you to imagine having electronic communication with you son on FaceTime, and imagine that your ex-wife has dressed him as a drag queen to talk to you. He has false eyelashes and makeup. His hair has got glitter in it. He's wearing a dress,' he said.

'Now imagine how you would feel seeing what I believe is actual sexual abuse - I believe this is not just emotional abuse but is the very, most fundamental form of sexual abuse, tampering with the sexual identity of a vulnerable boy. Every. Single. Day.

'You have to see your son sexually abused, and you have to maintain your calm... because the courts are not going to be fair to you. And the only way you can survive this and get your son through this alive is to calmly allow your son to be tortured right before your eyes and outlast the opposition. That's what it's like.'

Separate from the custody court battle, Younger had been campaigning to prevent his child's gender transition.

Websites and Facebook groups called 'Save James' have been set up and there is a GoFundMe page with about $52,000 in donations to help with Younger's court costs.