noun
grandpa's child; child very close to their grandfather
Describes a child who is emotionally close to their grandfather or is doted on by him. The two senses are merged because they describe the same relationship from slightly different angles.
うちの娘は完全におじいちゃん子で、週末はいつも祖父の家に行きたがる。
Our daughter is a total grandpa's child; she always wants to go to her grandfather's house on weekends.
おじいちゃん子だった彼は、祖父から多くのことを学んだ。
He was very close to his grandfather and learned a lot from him.