Let's start from the beginning.
Members of this house have genes which allows them to access Mana
through rituals, creating magical effects.
Boys cannot access magic due to an ancient curse
are two extremely important pieces of information.
The first suggests that this House was evolved to possess magical abilities, through natural selection. This whole reply is based on this assumption. You can disregard this if the genes were altered by modern scientific abilities in order to gain these magical abilities.
The second says that at some point in the history, both males and females had the ability to produce magic, and the change was sudden.
I'm also going to assume that this is essentially humans we're talking about, and as such physically males and females of Kardashians are not dissimilar to males and females of our world.
This society would have been different from an ancient human society in one major aspect.
There are two major reasons why most human societies all over the world are patriarchal; a) males are physically stronger and b) males produces billions of sperm while females produce a very limited amount of eggs, which are costly to produce. Due to the first reason, males are able to gain more power. Due to the second, females are required to take a much bigger burden on reproduction, need to be choosy when mating, and are required to devote a large portion of their time to child-raising in order to ensure their genes propagate.
In the world of Kardashians, the second would remain the same, but magic would compensate for their 'handicap' in the first (assuming male and female magic powers have no difference, and magic powers include ability to fight/kill with spells). This would mean that the society could still have been patriarchal, but not as much as ours. But more likely, gender would have played a far less important a role than in ours. Women would not have been at the mercy of men when it comes to physical power. This would mean that crowns may not have been inherited by the male first born, but the first born of any gender. There would have been female leaders throughout the history, who were emperors, warmongers, the works. And since this was an evolved trait, there's no reason to suspect that one gender would have been more 'resentful' of the other either. Gender would have been something that was necessary for reproduction, but not much else.
An important side-note:
You don't specify how magical abilities are inherited. Is it completely random (as in magic is depicted in most literature, such as Harry Potter world, where Muggles can give birth to Witches/Wizards and vise versa), or is magical ability strongly inherited such as our skin colors, general body types, etc? If it's the latter where magical ability is strongly inherited, in that two parents with high magical powers have a higher chance of producing offspring with high magical powers, then this world could end up significantly different. Early on in the evolution, less powerful individuals would have been quickly eliminated, but once they developed into societies, there's a possibility that much like in our ancient societies with power/money decided to marry within, these powerful individuals chose to marry within, creating different social classes with significantly different abilities, and it wouldn't take long for the powerful to 'enslave' the less powerful. This would throw everything off in your story, so I suggest we stay in a world where parents with powerful magic doesn't necessarily produce offspring with powerful magic.
Coming back to the topic, as gender roles would have been less important, there's no reason to suspect that there would have been communal raising of one gender and the like. Bottom line is, this would have been a society that was much more gender-equal (or more accurately, gender-inconsequential) up to the point where the curse would have been placed.
Now we have a world which is more gender equal, but all of a sudden the game changes. Now only women have magical abilities in an otherwise equal society. Chaos will ensue; at first it would be confusion, and not long after, a power struggle. If, eventually, women figured out that they're now unimaginably powerful than the men, they are going to use that advantage. We may have our ethics and moral principals, but those lines get moved around all the time. Women wouldn't necessarily outright try to overpower men, but with that much power in hand, you would be able to 'force' men to do what you want. Imagine whatever the equivalent of their security council; it may have had an equal representation of males and females, but now with more power, it's natural that women would band together, and when it comes to important decisions, their say will probably have more weight. This would happen all over the society, not immediately but not too slowly either. Within few years (or decades at most) an inevitable power shift would happen. Sure, men would resist, and blood will be shed, but we know who's going to win.
Rearranging the Society
With this new balance of power in place over few generations, it's pretty easy to form the society you envision. It doesn't make much to 're-educate' a class of people, be it gender based or whatever else. Women would band together into families, and men banished to creches. Sure, you don't have to treat as slaves per se, but you can 're-educate' them into accepting their fate pretty quickly. Again, this would not be uniform and not without exceptions; human emotions would play an important roles, there will be star crossed lovers who resist the change, but eventually, power will trump. So we can imagine a society, a few decades later, maybe a century, where people live like the way you describe, but here's the crux of the matter:
Inequality you describe may not be seen as inequality. Men performing duties they are duty bound would be seen as 'natural', much as we saw, for centuries, women staying home and taking care of children as 'natural' while men went out to dominate the world. So, I can envision this society where men are still valued, but there can be no 'balance', because 'balance' doesn't even make sense. Men will have their place in the society, but women will rule.