In which country can mother and son get a marriage certificate?

Most countries in Japan, Europe, the United States and Australia allow consanguineous marriage.

2. Some states in China, South Korea, North Korea, the Philippines and the United States prohibit consanguineous marriage.

In some areas, cousins are forbidden to get married, which is not only a genetic problem, but also an ethical problem. In a male-dominated society, cousins are considered to be closer to brothers and sisters than cousins.

Legal basis:

"Marriage Registration Regulations" Article 2 The marriage registration organ of mainland residents is the civil affairs department of the people's government at the county level or the township (town) people's government. The people's governments of provinces, autonomous regions and municipalities directly under the Central Government may, according to the principle of convenience, determine the specific organs for marriage registration of rural residents. China citizens and foreigners, mainland residents and residents of Hong Kong Special Administrative Region (hereinafter referred to as Hong Kong residents), Macao Special Administrative Region (hereinafter referred to as Macao residents), Taiwan Province Province residents (hereinafter referred to as Taiwan Province Province residents) and overseas Chinese shall register their marriages at the civil affairs departments of the people's governments of provinces, autonomous regions and municipalities directly under the Central Government or the organs determined by the civil affairs departments of the people's governments of provinces, autonomous regions and municipalities directly under the Central Government.