Her name was Publius.
YesThe son and his sister = 1 son, 1 sisterThe sons and their sister = many sons, 1 sisterThe son and his sisters = 1 son, many sistersThe sons and their sisters = many sons, many sistersThough in reality this is a strange way to say it. More normal would be "The sons and daughters".
his son
"Your sisters' names are Rose and Mary."
Its my sisters name,
yes that is my sisters name
Cleopatra
Your sister's son is your nephew.
Publius.
Neice or nephew no dummy its nephew
Because he had the same name as one of the conspirators
Uncle or Auntie.
Your sister's son is your nephew and you are his aunt (if you are female) or his uncle (if you are male.
No, making your son wear his sisters pants is not a good punishment.
Polytheistic.
Cousin
He is your cousin
nephew