The chart looks fine. I don't know all the scripts, so there could be a contentious arrow or two in it somewhere, but it's broadly correct. The alphabet (in the

The chart looks fine. I don't know all the scripts, so there could be a contentious arrow or two in it somewhere, but it's broadly correct. The alphabet (in the sense of a writing system that represents the language with a small fixed set of symbols representing sounds) appears to have been invented only once.