Mom randomly bought me orchids at a supermarket
 

So, they were cheap, and petty. But considering one of them came in a decorative packaging saying Dendrobium, I am hard pressed to belive any of them.
The first two pictures are of a plant labeled "Brassia", and i do belive it very likely is a hybrid of it just on the shape of the flower.
The pink one supposedly looks more red, something the phone can't seem to capture. The third one is, according to my mother, is more brownish than red, but the yellow is close on.
After digging somewhat, i'm led to belive the pink one is a miltoniopsis and the bicolor one to be miltonia.

That said, the only experience i have with either is breaching the world record for killing two miltoniopsis in record time (believed it was some random onc, never looked t the print on the pot). And considering all i heard was that miltoniopsis is a beast to take care of, i'd like to be prepared.

Thanks in advance

I think they are all Oncidium tribe intergeneneric hybrids. Even the one that looks like Miltoniopsis ...there is likely Odontoglossum or one of the other members of the tribe in there. With all the reclassification, I won't guess at genus names, I have not kept up with the nothogenus changes. But since I'm pretty sure they are all a mixture, culture will be pretty much the same. And likely much more forgiving than the species (or hybrids within given genera)

The red one looks like the very commonly found nelly isler (Burrageara/Cambria/Oncidopsis or whatever ppl are calling it now lol) - as Roberta says, it's an Oncidium hybrid. Here's some info from orchidroots: Oncidopsis Nelly Isler

So i should be treating them all like oncidiums, in terms of care? Even the Brassia-looking one?
Considering where they are bought, i expected them to be "random" hybrids of who knows what, but i hoped that taking on the looks of an ancestor often goes in toe with care requirements. Might be wrong on that one i guess.

Edit: For what it means, the packaging was of "Bush brothers", if it means anything at all. I am a bit more concerned about not killing the plants than to check out a website.

I think pretty much similar care for all. Bright but filtered light, kept on the moist side. Where you live, they're probably fine outside though maybe inside if nights get below about 5-6 deg C this winter, put them out in the spring so they can acclimate and they'll be fine outside going forward. (It is likely that they have been living in a greenhouse, so not acclimated to much cold but if given a chance to acclimate, could certainly do fine at lower temperatures)

If they want cool and sunny winters that are guaranteed to be frost free in all ways, i do have a small greenhouse (takes like half a day of sunlight, give or take, to keep night time temps almost never below 10c), it only comes down to weather or not they need a dry rest or not.
Also, by bright light, how much hours of sunlight would that allow? My Brassias get most of the morning, even more in winter, sharing the spots with D. nobile. I could also set them under a lemon tree on a wall, next to zygo's; it's darker, but spots of sunlight pass trough most of the day all year long, never remaining in a place long enough to burn anything. Most "bright light" labeled plants did well there, at least those who disliked sun, but the spot gets rained on, and I'm not sure how they handle it.

I don't think that they are particularly fussy. they should be fine in any of those potential spots. Hybrid vigor works in your favor!

What about the rain during the winter? Or should they dry rest, like most of my dendrobs?

No dry rest... like Oncidiums in general, they should never dry out. So rain is just no-cost water, if it doesn't rain then they still need watering.

I agree with the above. The yellow one with spots is probably a Bratonia (Brat.), Brassia x Miltonia.

People run into trouble with these when they don't water enough, or when temperatures are too high.

None is happy when it gets much over 35C, and those with cool-growing ancestors may not like being over 30C. Remember that direct sun heats them, so if air circulation isn't strong, they may get too hot even if air temperature should be fine.

Edit: European members have written that these Oncidium intergeneric hybrids have been called "Cambrias" in the past.