The Supreme Court has rejected an appeal against the 2012 Children's Referendum result.
The court this morning gave its decision on a challenge by a woman to a High Court ruling rejecting her petition to overturn the result.
She also appealed the High Court's decision to reject her challenge to the laws governing the bringing of such petitions.
Joanna Jordan, from Dún Laoghaire in Dublin, brought a petition to the High Court aimed at overturning the Yes vote in the Children's Referendum held in November 2012.
She had argued that the Government's use of public money to fund an unbalanced information campaign had materially affected the outcome of the referendum.
Shortly before the referendum took place, the Supreme Court held that the Government's spending of more than €1m of public money on a one-sided information campaign was a clear disregard of the limits imposed by the Constitution on what the State may do in a referendum.
However, the High Court rejected her case, saying the Government's conduct did not have a material effect on the outcome of the referendum.
Ms Jordan took a further legal action challenging the constitutionality of the laws under which she had to prove there had been such a material effect.
This too was rejected by the High Court.
Seven Supreme Court judges heard the appeal late last year and gave their decision today.
Speaking after today's hearing, Ms Jordan said she was disappointed and she hoped they would win.
She said the Children's Referendum will now be made law when the President signs the referendum certificate.
Ms Jordan said that will be a sad day for Ireland, because Irish parents will be losing their natural power over their own children.
Asked whether she might appeal to the European court, she said: "We are thinking about bringing it to Europe, and looking at all possibilities."