Ashita mo Ii Hi de Arimasu You ni. Isekai de Atarashii Kazoku ga Dekimashita: Sankyoudai no Hokkori Gohan Nikki

Three brothers—Yuito, Haruto, and Yuuma—lost their mother in a traffic accident and were taken in by their father (who lived apart from her), spending their days enduring unreasonable violence. Just when they were on the verge of despair, given no proper meals and having no relatives to rely on—they were caught in a landslide and all three were reincarnated together into an isekai. A passing adventurer, Thomas, protected the three who had collapsed by the roadside, and together with his wife Olivia, who runs the eatery "Olive Tree," they welcomed the three as a "new family"... A warm isekai slow life spun by the beloved three brothers begins!

(Source: Earth Star Entertainment, translated)