Nigel Rowe, 44, and his wife Sally, 42, removed their six-year-old son from an unnamed school after a classmate was declared "transgendered" and came to the school demanding to be recognised as female on some days.
They are also set to argue that to school has acted without due regard to the best interests of their son and has failed to consult other parents.
"A child aged six would sometimes come to school as a girl or sometimes come to school as a boy", Nigel explained in a Christian Concerns video.
Nigel and Sally Rowe said their son became confused as to why the child dressed as both a boy and a girl.
Sally Rowe claimed to have a good relationship with the parents of the trans child but said that she became increasingly confused about the child after they turned up to a "royal" fancy dress party in a blue velvet dress.
"We believe it is wrong to encourage very young children to embrace transgenderism, boys are boys and girls are girls".
The Voice 7 : Florent Pagny et Mika rempilent !
Le gros changement de la nouvelle saison de The Voice , c'est le remplacement de Matt Pokora par Pasal Obispo! TF1 a officialisé ce lundi 11 septembre la composition du jury pour la septième saison de son programme.
Lawyers for the couple are expected to say that the school can not rely on the Equalities Act because legal recognition of gender reassignment is only given to those over the age of 18, the Sunday Times reports. It's a massive thing for a six year old, they need support, love and compassion and it should be dealt with in a private sphere first and not in a school where it affects many people'.
A Diocese of Portsmouth spokesman said: 'Our schools are inclusive, safe spaces where pupils learn to respect diversity of all kinds.
The Rowes also argue the school has breached their right to raise their kids in line with their Christian beliefs.
The school, which has not been named publicly, said it had policies in place to tackle transphobic behaviour.
However, the school has defended its behaviour by claiming pupils are protected under the Equalities Act of 2010 and stating: "The refusal to acknowledge a transgendered person's true gender" was "transphobic behaviour". "We comply with the legal requirements of the Equality Act 2010 and believe that all should feel welcomed, valued and nurtured as part of a learning community". Andrea Williams, the centre's chief executive, commented: "This new transgender ideology is being aggressively imposed on unsuspecting schools, parents and children".
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