A casual, colloquial form of 'grandma' used affectionately for one's grandmother; informal.
うちのばあちゃんは料理が上手だ。
My grandma is good at cooking.
ばあちゃんに電話したら元気そうだったよ。
When I called grandma, she sounded well.
子どもたちはばあちゃんのひざの上で遊んでいた。
The children were playing on grandma's lap.
Can also be used for an older woman who is not a family member, used affectionately or casually.
近所のばあちゃんたちが毎朝公園で会っている。
The neighborhood grandmas meet every morning in the park.
駅前のばあちゃんが道を教えてくれた。
The elderly woman in front of the station showed me the way.