Transborderwife

I am against property destruction. Period.

This has to be a wind up.

Some officers don't even give the chance to say that you can show docs.  It's at their discretion.  Do you have much knowledge of the Moroccan consulate?  Giving hope for a tourist visa here isn't very helpful.

I don't know what to tell you other than your chances of ever getting a tourist visa are slim to none.  Morocco is an incredibly difficult embassy and high fraud 

Which is he a citizen or greencard holder?

Well if the worst comes to the worst her Mother can petition her again.

She's here, marry stay and adjust 

She can apply for an SB1 returning residents visa evidencing how she has maintained the US as her permanent residence.

No, not possible. When you file all the papers, you must include a note with signatures verifying that you are both free to marry. But you can't do that because that wouldn't be true.
You'll have to wait until the divorce is finalized. Don't forget to hang onto all the final divorce papers because you will need those as well.

It really depends on the state whether you can apply without a GC or not. Tennessee can be a hassle but they hand out an eight year valid temporary drivers license (don't ask me how eight years is temporary since the normal DL's are the same) 

That's why my Senators get so much hate 

Did you ever drive through with Red Wings flags flying on your car?
 
Toronto hates winners.

And the taxpayers actually get stuff in return for it, imagine that? Canadian infrastructure makes most of the the US look like a mud hole.

The theory is that, while not usually a medical emergency, it is in the best interest of the US for the child -- who will be a US citizen and eligible for any benefits of a US citizen -- to receive proper prenatal care and be born healthy.

It says Medicaid in Texas covers pregnant women who are legal permanent residents:
 
https://www.plannedparenthoodhealthinsurancefacts.org/plans/medicaid/i-am-not-us-citizen-can-i-still-be-eligible-medicaid/
 
Take her to Planned Parenthood and you can inform yourselves there.
 
 
Pregnant women are an exception in some states. See the link from planned parenthood I posted.
 
 

He was being sarcastic. You need to be 65 to apply for medicare.
 

She is 65?

"Fairness" isn't the goal. Security and lawful immigration are. 

There's usually a good reason for denial.  It's not arbitrary 

When was your mom issued the K-1 visa? If it was less than 1 year ago, then your sister can utilize follow-to-join to obtain a K-2 visa. ETA: probably a month or two depending on embassy.
 
Otherwise, for your sister your USC stepdad can file an I-130. ETA: ~1 year form filing to visa in hand
 
As for your brother...how old was he when your mom and stepdad got married? If he was under 18, then he can use the same process as your sister. Otherwise, you mom has to file for him. ETA: ~2 years. He shouldn't age out (turn 21) if she files fairly soon.

Wise heads may have a better view of this, but you're working while on a tourist visa and plan to continue working?  That's a grey area I believe, even if the company is not in the US.

You can stay and apply for adjustment of status now that you are already in the US. Here is a guide to help you with the steps ... http://www.visajourney.com/content/i130guide2
 
Keep in mind that you will not be able to leave the US or work until you have authorization, which could be a few months.

I've personally experienced being turned around at the border due to this "notion" so it's truth, as have others on here.  She has the visa, is likely going to be able to enter.  It's irrelevant at this point 

As Transborderwife said, is it up to the officer's discretion, and it can be considered work,
Personally, my mother travelling on a tourist visa entered the US and told the border officer she was coming "for 3 months to help out since her granddaughter was just born"...the officer let her through with no issue.  That doesn't mean everyone will be allowed entry with this reason, though.  I suppose it would depend on variable factors.

She applied for a visitor visa not a work visa.