It should be Wei Heng, a calligrapher at the end of Wei Dynasty and the beginning of Jin Dynasty. Both his father and grandfather are good at reading.
The Book of Jin mentioned that the three generations of Wei were all great calligraphers. When Wei Heng was mentioned, he said that his calligraphy was good and he was known as "Jushan III" internationally.
Baidu Encyclopedia can find relevant information. Of course, you'd better check the original.
For reference.