vogeltje wrote:Why did your father learn Yiddish when he was younger? has Yidddish some native speakers now, or before (when?)
Yiddish was the first language of many European Jews from about the 9th or 10th century. It was the leading vernacular language among Ashkenazi Jews before the Holocaust. My father learnt it from his parents - they emigrated from Poland to Mexico in the early 1930's (before the war, but during the pogroms in Poland) and then Yiddish was an important heritage language to the large Polish/Russian Jewish population in Lat Am.
Today, Yiddish is disappearing - although it was spoke as a first language - it just doesn't get passed on versus local dominant languages. For example, Isaac Asimov's first language was Yiddish but you know him as an English author.
Yes, there are still communities where it is the primary spoken language - especially among the Hassidim Jews. The US has over 100,000 primo speakers, the UK maybe a 1/3 of that and Sweden, Germany and several other EU countries have it as an official minority language. A generation ago it over 11 million speakers, now probably around a 10th of that.
But it has a large literature and cultural base, there is even a wikipedia version in yiddish:
https://yi.wikipedia.org. For example, the painter Marc Chagall and the Nobel Lit writer - Isaac Bashevis Singer were two Yiddish native speakers. It is a language with a strong literary production.