My Rise as the Clan Grandfather

I went to sleep a 28-year-old man and woke up as a grandfather. Suddenly, I'm the patriarch of a struggling farming family with a legacy to build and too many mouths to feed. They see a tired old man, but I have the mind of my past life and a will of iron. Enemies think we're just poor farmers destined for dirt. They're wrong. Using my modern knowledge, I will forge this family into a clan that makes kingdoms tremble. But first, we have to survive the winter.