Question: Who is the maternal grandmother of Tiberius Gemellus?
Sentence (from "Tiberius Gemellus"): Their removal allowed Gemellus and Caligula to be named joint-heirs by Tiberius in 35, a decision that ultimately resulted in Caligula assuming power and having Gemellus killed, or by forcing him to kill himself, in late 37 or early 38.
Relevant evidence: No