The brothers were all close, having lost their father when the eldest Jacob, was just eleven. years old. Jacob, and Wilhelm (and Wilhelm's wife) all lived together so Ludwig was home. There were a total of five Grimm brothers. Shared hardship, shared genius, resulted in a very close knit family.
Here is a cat Ludwig Emil Grimm did. Not very sentimental: he labeled it "To the Mice, in Fond Memory," (Den Mäusen zur freundlichen Erinnerung). It is dated to 1855-56.