McMillan family has a title, they're barons of the new aristocrats with too much money, original Raeliana accepted the commitment to be a Marchioness, but the Marquisate of the Brooks is bankrupt, they are only nobles by name, however, this family are among the oldest aristocrats in the kingdom
The protagonist as she didn't know what Raeliana's parents were like, she believed that they were the typical parents of that time who forced her to marry their daughters for the good of the family, that's why she got involved with Noah, but then she realized that the engagement could be broken if she only wanted it since her parents prioritize her happiness over status, this can be noticed even when the protagonist returns to the McMillan house (Even the protagonist says that for the birth of Raeliana, they made a painting on the ceiling of his room to remind him that he is a blessing for them), she only had to pay some money to the Brooks but the parents were willing to do that, but since she had already thrown his tongue with Noah, she had to continue with the game.
The protagonist tells the real Raeliana that don't value what she had precisely because of the time in which they live, where domestic abuse is so normalized and practically sell their children to the highest bidder, some out of greed and others cause it's the best for their children or family, this is a fact, we can see it with the parents of the ML who I dare to say if the mother were alive would've even chosen his woman, others would be the king, the siblings Shamall, Pryse Eriteal, etc.
The only parents that I have seen that care about their children are precisely the Barons McMillan who were the parents of the original Raeliana, and the Duke of Blake who is currently the adoptive father of the original Raeliana.
(I mention Blake because even though he adopted "Beatrice" to fill the void of his dead daughters, he treat her as a real daughter, gave her everything, when the carriage happened Aaron support her and cause of what I see, he hidden orphan and commoner Beatrice's origin that she acquired after changing bodies, after all, the noble ladies who treated the protagonist badly for being the daughter of barons, treated the current Beatrice too well, as if they did not know the origin of her)
That's why the main character sees her as stupid, because she had something that many of the other characters in the story would have loved to have, she had a good family with money that really loves her, even seeing that there are characters like Adam and Heika, who didn't have childhood or even herself who came to that world to become Beatrice, she was left without a family and was going to be left as an orphan commoner in an extremely painful era, especially for those who didn't have money.