
One of the twins is going to get with theo

Theo is a beta. The Seigfried family doesn't have omega servants. And I highly doubt a family would allow an alpha son to be a servant either.
He couldn't be with the twins. They have to have a heat to be able to "accept" the alpha. It's why the omegas use the drugs to induce the heat symptoms outside of the normal cycle. Their bodies can't handle it otherwise.

Has it been stated explicitly? No, you're right. But what was stated in both Remnant and Pendulum is that the only thing omegas are allowed to do in the Seigfried household is have babies. Kai was supposed to be added to the breeding group once his heat came. Baron scoffed at Daato thinking he'd be a servant.
Alphas are rare, even human ones. They're supposed to be the best and the brightest. You really think any family would let their alpha son be a servant?
Betas are the vast majority of the population. The exceptionally overwhelming likelihood is that Theo is one.

Jura you Idiot! Thats his sister! Be a bit more considerate!

I'm sorry but Jura is at fault here. Daato is put in an unfamiliar Environment with no One to confine in and other omegas who shit on him! He is forced into a live he absolutely didn't want for himself and is in a Way confined to the west wing, you expect him to take it laying down? Juda doesn't Show hin any willingness to try to get to know hin or treats him like an actual human bring. and expects hin to just accept his situation and be actually Happy about it!
And juda outright denies him his one wish to know what happened to his sister who lived in a human trafficking orphanage. And instead of tekking Daato that he will try bis best to find out but he can't make any Promises, he outright tells Daato that he doesn't give a fuck about bis family ans it's to much of a hassel to just get information because he doesn't care enough about Daato.
I can understand Why Daato proposes the Deal, because he needs to take a bit of control over his live back!

http://www.mangago.zone/read-manga/ashita_wa_docchi_da/bt/manga/ashita_wa_docchi_da/c009/pg-34/
I Really Love that Panel and i somehow read over it before!
But Mommy defenatly knows

What happens to Bella and Julio? Do they Stop the Evil Goat priest? I'm Really worried!

It's not canon but there is nothing they could do, even if Juda is wealthy with the lack of proof and the witness they only have is a child, who would believe a child?
Second even if they did this isn't 20th century this takes place like in
like mid 18th that's not how their law works (idrk since it seems like this is either France or Britain).
Also the priest seems influential and have a lot of money. If we look how this world work, Omega's are look down upon but they're rare and expensive in the market, they're the only one who can carry a half which what their society wants. if I make you choose between Omega's with large dowry or Omega's from slave trade costing large price though small compare to the dowry, of course as a person with money problem or just plain cheap stake you'll choose the second one .

At the beginning of the chapter I had the exact thoughts as Siwons little speech!!
And Kang Jun doesn't even consider, such a lovely little asshole.
But as always in Yaoi it is I couldn't capture your heart right away so I can only make your Body mine.
(which by the way is such a dickmove and would absolutly not get you the other person)

Wait until you read ch19

I love that in chapter 508 you learn who all had sex in Fairy Tail!!
http://www.mangago.zone/read-manga/fairy_tail/mr/fairy-tail/508/pg-1/

I went back to that over and over to check. I even questioned my sanity but hoooooh~! It's really Rogue!! (≧∀≦) Jellal was shown too but there's no reaction from him. I dunno if it's because he's unconscious and it doesn't work on those who are unconscious OR HE'S STILL A VIRGIN. I'm all for the latter ヾ(☆▽☆)
I would have loved if they were a Switch couples!