When I was little, I often went to my maternal grandmother's house to play.
Tips
usage
外祖母 is the formal term. In daily speech, most people say 外婆 (wàipó, southern China) or 姥姥 (lǎolao, northern China). 外 means 'outer/maternal side' — distinguishing from 祖母 (zǔmǔ, paternal grandmother).
