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I can't answer your other questions, but I am a member of NFCU so I can tell you about that part.
When joining NFCU, they will do a hard inquiry on your Transunion for membership. Even if you apply for the BT the same day, they will do another hard inquiry for that. Some people are noticing that for some products, NFCU is now pulling Experian reports.
I applied for a secured card through NFCU back in March, and they pulled my Transunion and Equifax for the card even though it's secured.
Not ideal but can you take a cash advance on one of your other cards to pay the minimum payment on the card you're in jeapardy of going 30 days late on?
It's basically rearranging your debt, and isn't close to being a great idea, but it'll give you a few weeks of breathing room to figure stuff out.
It might help if you list the cards you have and the balance/limit for them. others that are smarter than me might be able to offer up a much better idea. Also, asking in the rebuilding forum would probably offer more ideas for the credit card.
Good luck
What's the payment amount that's due?
Can you liquidate, sell, pawn or otherwise get rid of something you own to cover it?
Your sister's medical debt might have been better off to arrange payments on rather than put it on credit. Almost all hospitals will accept payment arrangements within the affordability range of the person responsible for them. Recently (2016) had a friend with a $25,000 hospital bill and I told them to work out arrangements rather than max out his credit. They told him $50 a week is the minimum they'd accept. He's paying $400 a month.
I think when thinking about a mortgage, avoiding the late payment is the most important thing.
I'm just in the researching phase and planning on buying a house this summer, but everything I read said you couldn't have late payments within a year or so. That may not be 100% true though.
What is the minimum payment due? If you can qualify for Paypal credit you can possibly send money to your husband or vice versa. It's a hidden tradeline which means although the inquiry hits your credit the actual account doesn't and if qualified you can use it immediately.
Just tossing out ideas. There doesn't seem to be any great fixes, so basically you're just looking to do whatever you can to avoid the late payment.
Almost ALL hospitals and doctors WILL offer payment arrangements, but you have to ask. Sometimes you have to ask twice, two different people.
When I earned my most in my life EVER (6 figures, strong) I had $4000 in medical work done and my insurance wouldn't cover it (pre-existing). At the clinic during check-in I asked if I could arrange payments and she asked my income (I was honest) and said "Can you afford $100 a week?" and I got the arrangement, no interest. Paid it off in 60 days, but it was nice to know even with strong income back then, I still qualified for help.
Also, I hate to ask but it's here: does your sister have any assets SHE can sell? Or any credit lines she can temporarily borrow from?