Sounds far too complicated for me, Mr. H. I had a cousin who was a linguist. She fluently spoke about 8 languages. Whether they were genuinely different or related languages I couldn't say. But I do remember her telling me when I was still at school that the only way to learn a language was to go and live amongst the people.

When I worked as a consultant/lecturer/trainer I often found myself in countries where I had no idea of the language, but English is pretty universal and I always got by. But whilst in Munich I met a Scotsman who spoke fluent German. He had moved out there 6 years earlier with no idea of the language. I had to admire him.