Taiwan has just taken a major step towards increasing rights for lesbian and gay people. The top court has ruled it is unconstitutional to ban same-sex couples from getting married and legally registering those marriages. Parliament now has two years to amend the law, or same-sex couple will be able to marry under existing laws. Jay Lin and his partner are raising twin sons, conceived with the help of an egg donor and a surrogate mother. Jay, their biological father, told the BBC why a law change was important to him and his family.