Charlotte was formally adopted by her own father Louis at the Monégasque embassy in Paris on 16 May 1919, in the presence of her grandfather Albert I, the French president Poincaré, and the mayor of Monaco. There is a doubt on the legality of the adoption. The Monégasque civil code (articles 240 and 243) required that the adopting party be of at least age fifty and the adoptee of at least age twenty-one. The 1918 ordinance changed the adoptee's minimum age to eighteen (Charlotte was twenty at the time of adoption) but "not" the other age limit, Prince Louis then being only aged forty-eight.