That could do with re-phrasing, sorry
In Roman myth, Diana and Apollo are children of Jupiter and Latona.
Apollo
diana/artemis was goddess of the hunt and twin to apollo.
Apollo and his twin sister Diana did not attack Niobe. They did however attack and kill Niobe's children because she had said to Leto, the mother of Apollo and Diana, that she (Niobe) was more of a mother who had 14 children than Leto who had only two.
The twin sister of Apollo in Greek mythology is Artemis, the goddess of the hunt. Her Roman counterpart is Diana.
The twin of the Roman goddess Diana is Apollo (also spelled Apollon).
Apollo was her brother
Apollo was a god, not a goddess. His Roman name was the same as his Greek one. However, he had a twin sister, Artemis, whose Roman name was Diana.
Yes, the Roman goddess Diana has a twin brother named Apollo.
Diana was the roman goddess of the moon and the hunt. Her brother is phoebus Apollo. Her greek counterpart is Artemis
Diana was born on the island of Delos. She was born before her twin brother Apollo and was her mother's midwife.
She was born day before her twin brother Apollo.