Under Swiss law, opponents of a bill passed by Parliament have one hundred days to collect 50,000 valid signatures.
Article 27 of the Registered Partnership Act treats the matter of the partner's child/children.
The law states that the partner of the biological/adoptive parent must provide financial support for their partner's child and also possesses the full legal authority to represent the child in every matter as being the parent's partner.
However, the debate and close vote provided a view on the MPs' opinions and the evolution of minds, as for example Maja Ingold, MP of the Evangelical People's Party of Switzerland, who spoke for more recognition of gay and lesbian parents while her party campaigned against the Registered Partnership Act back in 2005.
It became clear that, while there was no majority for full joint adoption, allowing adoption of one's partner's child could gather majority support in Parliament.
Former President Simonetta Sommaruga came out in support of the bill and stated that it is necessary to legally protect children already raised by same-sex couples.
On , the National Council's Committee on Legal Affairs voted 15-9 to approve the bill.The Council of States, the upper house (Senate) of the federal Parliament accepted the petition and the Legal Affairs Committee approved a motion of openly gay MP Claude Janiak (SPS) backing the right to full joint adoption regardless of marital status or sexual orientation.In November 2011, the Committee voted unanimously in favour, including members of the conservative Swiss People's Party.Single people, regardless of sexual orientation, may adopt children.A bill legalizing stepchild adoption for same-sex couples was approved by Parliament in Spring 2016.The canton with the least partnerships was Appenzell Innerrhoden. The canton of Geneva has had a partnership law on cantonal level since 2001.