St. Rose of Lima had 10 brothers and sisters but the names are not mentioned in any biography I have read. For more information on the first native born saint in the Americas, click on the link below.
Saint Rita had two siblings: a brother named Antonio and a sister named Maria.
If you are referring to Saint Dominic Savio, he had 9 brothers and sisters.
Saint John of God had a sister named Anne and a brother. He was also reported to have had other siblings, but we do not have specific names.
If Sophia had any siblings, there is no record of them.
St. Francis had six siblings - sex unknown.
We do not know how many siblings Peter might have had but we do know he had at least one brother named Andrew.
There are a number of saints named Elizabeth. Please be specific.
He had a younger brother named Navigius and a younger sister named Perpetua.
Saint Benedict of Nursia had a twin sister named Scholastica. If he had additional siblings, their names are not recorded.
His father was named Jonah (or Jona) and he had a brother named Simon. We do not know his mother's name or if he had other siblings.
There is no written record of any siblings that Sebastian may have had.
Saint Augustine of Hippo had two siblings, a brother named Navigius and a sister whose name is not known. His brother Navigius followed him into Christian ministry, while his sister is mentioned in Augustine's writings but her name is not recorded.