A local political fight has broken out in Taiwan's Taitung over whether a sitting mayor's son should run for the body that oversees his father, a bad look for the incumbent but not yet a legal problem.

• Taitung's KMT mayor Chen Ming-feng is seeking re-election while his son registered to run for city representative — the seat that supervises the mayor.
• Former mayor and DPP figure Lai Kun-cheng called it arrogance, saying the father assumes he has already won and is handing his son a seat.
• Chen hit back by pointing to the DPP's own family precedent, when Su Tseng-chang was premier while his daughter served in the legislature.
• Chen also framed his son's run as young people entering politics, something the DPP itself says it wants to encourage.
• Registration for the county magistrate race closed with four candidates, including the DPP and KMT picks plus two outsiders, widening the contest.

Outlook: The family-ticket row is likely to shape the tone of Taitung's local campaign through election day.