The Wikipedia article for "Saint Anthony" lists several people of that name. But all of them are long dead. So would their siblings be, in case they had any. So, no.
There is no record of the names of the parents or of any siblings that St. Anthony may have had.
If St. Matthew had any siblings, there is no record of them.
Historians are uncertain about whether St. Paul had any siblings as there is no specific mention of them in historical records or the Bible. St. Paul himself does not mention any siblings in his letters.
Yes, St. John Neumann had five siblings: three brothers and two sisters.
If Nicholas had any siblings there is no record of their names.
If Cecilia had any siblings, there is no record of them.
The address of the St. Anthony Library is: 2941 Pentagon Drive NE, St Anthony, 55418 3209
If St. Jerome had any siblings their names and very existence are not recorded in any biography I have read.
If Lucy had any brothers or sisters there is no record of them.
There is no record of any siblings Lucy may have had.
If Cecilia had any siblings, there is no record of them.
SMK St. Anthony was created in 1932.