Her biographies state that she was one of many children in the family,
She came from a large family but the names of her brothers and sisters are no where to be found in her biographies.
St. Clare's siblings were named Agnes and Beatrix.
His father's name was Jacob. The names of his mother and his siblings are unknown.
If Patrick had any siblings there is no record of them or their names.
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.
If Nicholas had any siblings there is no record of their names.
If St. Lucy had any siblings we are unaware of them or their names.
There is no record of her grandparent's names.
Francis had six siblings but their names and sexes are not recorded.
St. Thomas the Apostle is traditionally believed to have had several siblings, though the Bible does not provide their names. However, the Gospels mention James, Joseph, Simon, and Judas as brothers of Jesus, which some traditions interpret as being the siblings of St. Thomas as well. The names of Thomas's siblings are not explicitly detailed in Christian texts, leading to some ambiguity regarding their identities.
If Patrick had any siblings, there is no record of their names.
Francis had six siblings but their names and sexes are not recorded.