Fair City drops a familial bombshell in Sunday's episode on RTÉ One and the RTÉ Player.

Just as Joan thinks she's building bridges with her long-lost son Gar, a woman arrives at the gym.

"Are you the owner?" she asks curtly.

"No, my son is," smiles Joan as Gar emerges from the office.

"Ma?" says Gar.

Both women answer: "Yeah?"

Fans can find out what happens next on Sunday on RTÉ One and the RTÉ Player at 8:30pm.

Fair City airs on RTÉ One and the RTÉ Player on Sundays, Tuesdays, Thursdays and Fridays.

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Catch up on Fair City on the RTÉ Player.