My grandpa in the Marshall Islands or an excursion into the wondrous world of German family narratives

In addition to childhood memories, the puppeteer Vanessa Valk has two photo albums and a diary from her grandfather, which bear witness to his trip to the Marshall Islands in 1911. Grandpa was considered a "hero" in the family's stories. He stayed there for three years until the patriot left a "South Sea woman" on the islands and returned to go to war for his fatherland. From today's perspective, how does the story of a genuine colonialist, whose heroic anecdotes in the family lore covered up his later Nazism, tell itself?