The Portugal captain had already been defended by one family member after national coach Fernando Santos dropped him for a last 16 tie against Switzerland and saw the team win 6-1.
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Santos' huge call reaped huge rewards, with Ronaldo's status at the top of the game now in doubt at club and international level after an incredible career.
His replacement against the Swiss, Goncalo Ramos, scored the first hat-trick of the World Cup to make matters worse for Ronaldo as his chances of regaining his spot look remote.
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In the days following the match, drama has stirred over whether the 37-year-old is training with the substitutes or starting players, while some reports even claimed he may leave early.
Ronaldo has since denied those claims on social media, saying 'the group is too close to be broken by outside forces,' but that isn't enough for his sister.
After one sibling, Elma, called Santos' decision a humiliation, now Katia Aveiro has posted her thoughts on Instagram.
Starting off on a positive, she wrote: "Portugal has won. Thank you GOD. New talents have come through. Wonderful. Are we going to win this? I believe so!!
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"On the pitch they shouted for Ronaldo. It wasn't for Portugal to win… And I'm not the one saying this. The world has watched …. Why is this??? Glad Portugal won… (I've seen Portugal win so many times).
"And this doesn't invalidate the majority of the Portuguese people. And this is what's wrong because they keep cursing, keep insisting on offence and ingratitude.
"So sad with what I read and hear, not here in Qatar but in my country, in his country…
But it's really sad."
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She then revealed that she was desperate for her brother to return home, saying: "AND I WANTED IT SO MUCH.
"I really wanted him to come home, leave the national team and sit by our side so we can hug him and tell him that everything is fine, remind him what he achieved and what house he came from.
"I really wanted him not to go there anymore, we already suffered enough (they will never know how much) you are great and the little ones don't realise how huge you are…
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"Come to your house. Which is where they understand you, where they embrace you. As it always has been. Where is all the gratitude. And not ingratitude. Thank you Ronaldo [followed by five more thank yous]
"I really wanted it… But you decide what you decide we're with you. Till death do. Thank you."