is 18. The law is only valid in the European territory of the Netherlands and on the Caribbean islands of Bonaire, Sint Eustatius and Saba, but does not apply to the other constituent countries of the Kingdom of the Netherlands. The single legal difference between same-sex marriages and heterosexual marriages was that, in the former case, parentage by both partners was not automatic. The legal mother of a child is its biological mother (article 1:198 of the civil law) and the father is (in principle) the man she is married to or in a registered partnership with when the child is born. Moreover, the father must be a man (article 1:199). The other partner could thus become a legal mother only through adoption. Only in the case when a biological father did not become a parent (e.g. in case of artificial insemination by lesbian couples) would both female spouses obtain parental authority automatically (article 1:253sa). In December 2013, the Dutch Parliament changed this and allowed automatic parenthood for lesbian couples. The new law, which came into effect on 1 April 2014, allows the co-mother who is married to or in a registered partnership with the biological mother to be automatically recognized as a legal mother if the sperm donor was initially anonymous. In the case of a known donor, the biological mother decides whether the donor or the co-mother is the child's second legal parent. On 6 April 2016, Minister of Foreign Affairs Bert Koenders and Minister of Security and Justice Ard van der Steur confirmed the Dutch position that, like other couples, same-sex couples who are not Dutch residents or nationals cannot marry in the country. The ministers argued that it might lead to "practical and legal problems" and could even be "dangerous" to some participants. The move came after the Liberal Democratic Party had asked the ministers to look into allowing non-resident foreigners to take advantage of the Netherlands' same-sex marriage law. Religious performance Since the mid-1960s, religious solemnizations of same-sex relationships have taken place in some Dutch churches. The Dutch Remonstrants were Europe's first Christian denomination to officially allow such solemnizations in 1986. The Mennonite Church in the Netherlands also allows solemnizations of same-sex marriages. The Old Catholic Church of the Netherlands has allowed its ministers to perform same-sex marriages in its places of worship since 2006. The Protestant Church in the Netherlands, the largest Protestant denomination