The Geni Consistency Checker will report "Siblings share the same first name" on two or more siblings that have the same first name but no other distinguishing information (such as different gender, different middle or last names, non-overlapping lifespans, etc). Often this means the parents' profiles have been merged on Geni but duplicate children (now siblings) were not.
This inconsistency is always considered Informational
Autofix: There is no autofix for this inconsistency. If the siblings are actually duplicates, you should merge them.