LondonElite

This is not the case. I have not read all pages of this thread, but dual/triple citizenship BY BIRTHRIGHT, rather than by NATURALISATION, is accepted and permitted.

So, for example, if a German father and a Canadian (for the sake of example) mother had children, that child would automatically have both German and Canadian citizenship. If the mother had, say Canadian and Martian citizenship, the child would have German, Canadian, and Martian citizenship.

What is generally not permitted - though there are exceptions to this as well - is for a German citizen to voluntarily (ie through naturalisation) acquire a second citizenship. So if a German citizen applies for, say, Australian citizenship (assuming he is entitled to this) he loses his German citizenship unless he has received special permission granting him the right to maintain his German citizenship. It is important to realise that merely the act of applying for a second citizenship, and not its granting, forfeits his right to German citizenship.

The obvious (recent) change to this is EU citizenships. Germany will allow its citizens to voluntarily acquire another EU citizenship. So, for example, a German living in the UK, who potentially has a right to UK citizenship could successfully have both.

Germany operates on the basis of jus sanguinis, or citizenship by blood, unlike most other countries which operate on the basis of jus soli, or citizenship based on the law of the soil.