Katia Aveiro labelled the 33-year-old's sending off as "shameful" after an off the ball incident with Valencia's Jeison Murillo.
Aveiro, 41, seemed almost as angry as her brother in the aftermath of his red card.
She posted on Instagram: "Shame on football… justice will be done… [you] want to destroy my brother but God never sleeps…
Ronaldo saw red for the first time in his 15-year Champions League-playing career.
The 33-year-old has scored 120 times in the competition during his incredible career, winning the trophy last season at Real Madrid.
Ronaldo left the pitch in tears after grabbing at Murillo's hair after he fell to the ground at the Mediterranean city.
The forward clearly thought the sending off was harsh and began crying as he left the field of play, while his manager complained to officials.
And Katia is one of those close to the five-time Ballon d'Or winner to jump to his defence, while the former Manchester United ace could miss a second emotional return to Old Trafford.
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