So Scots (seen here https://youtu.be/vRnQ8lYcvFU (not to be with confused Scottish Gaelic or Modern English with a Scottish accent)) diverged from Middle English (as did our own variety - Modern English) so.. in this sense it can be described as a variety of "English" when "English" means "Middle English".

It is mutually intelligable with Modern English.

But if we mean "English" to mean "Modern English" then would Scots be a language or a dialect?

It is comparable to then, systematically to the Latin and the Romance languages (Italian, French, Romanian, Castilian etc.)

Although I think in terms of mutual inteligability it is closer to say, Macedonian and Bulgarian.. or Kazakh and Kyrgyz (very mutually inteligable)

If "English" means "all English ever" then Scots is a dialect.

If "English" means "Modern English" then.. is Scots a language?

Example of Scots (from above)