Wrong. His paternal grandmother as far as we know is still alive and his maternal grandmother we never hear how she met her end.
You have, but since I didn't specify adoptive, Pembers' answer could be correct too. Lister's paternal grandmother biologically is Kochanski. Your turn.
Mr Century has been very clear, the question was regarding Lister's adoptive grandmother, you therefore answered correctly. It is now your turn, make it a good one.
Mind your own business! You're turning into the new Billy Salt!!!! I shall retire to my chambers to contour up a taxing question!!!!!!