@aigomorla just to say, it is not queen consort. it is king consort. Even if the king is not from royal blood, he doesn't become or is named the queen. You just need to add the consort part and everyone should understand that spouse is not from the main family. If I remember correctly, this nation is not a "kingdom or queendom." He said that in this world, the powerhouses' power is based on the gatcha system lol. Whoever has more power or shows that have more power/trait that of their ancestors will become the next king/queen. I can't remember if his aunt already has a child or not.
But the most important thing is that the king himself named him as the crown prince. His consort is dead [can't remember if the queen was the one with the royal blood, the king, or both] so he is the only one with the most power. Since the king himself named him the crown prince, his mother has to kneel, too. The king skipped his children's rights and just went to the next generation and given them to the grandson.
Since all the princes/es are very close to one another and don't care much about who can control the kingdom because they all share the responsibilities, they are ok having the grandson of the second royal child to get all the power. Otherwise, everybody would be fighting with one another looking at whose trait is closer to the founders. She didn't give him the power and since she is the second or third child in the royal family, she can't be standing next to him. It is like siblings. One is given the title of a count and the other of the marquise by the king/queen.