‘Vincent You’re my brother, You’ll never need To doubt me. Since our childhood promise, You are in my soul’   Did you know that Vincent van Gogh had a younger brother? And that they were extremely close, corresponding in letters with Theo, a successful art dealer, proving determined to both publicise Vincent’s artwork and support his brother through his mental health struggles?   Vagabond Skies, the van Gogh Musical, makes its Edinburgh Fringe debut this summer, condensed dow