Matteusz Andrzejewski's babcia was his grandmother, and the mother of Matteusz's father.
In 2015, Matteusz visited her in Poland for her birthday, with his father. She took him aside and asked him to tell her the truth about his homosexuality. Matteusz finally told his grandmother about who he was. She already knew, but wanted to hear it from him. She called her grandson "Matti". (TV: Detained)