Tiffany,
I am so very sorry for the devastating loss of Jacob and Joshua.  Your love for them laces every word in your blog.  And, I wish that you could be together as a typical family with newborns.  Truly, I am so very sorry.  
I am a fraternal twin.  My sisters are identical twins.  And I have 3 surviving quadruplets.  My mother was restricted to bedrest carrying her two sets of twins ... But had us all full term.  I had my quadruplets at exactly 25 weeks with bedrest at 16 weeks.  We lost our son Alex at 3 weeks old, in the NICU.
Multiples are fun.  We love them.  Seeing them in public and on tv is a thrill.  People are in love with many babies born at once.
The truth is ... the human body is not made to carry more baby than one.  Because of this, there are many *many* twins delivered into an NICU.  And many twins, triplets, quadruplets, etc. die ... or at least some die at the hospital.  
You did not let your babies down.  And they wanted to stay.  I am sure of it.  
Having multiples makes for a very difficult pregnancy.  You did everything you could to get your babies here healthy and safe.  Please remember, I believe there are far more multiple pregnancies that are difficult or go very wrong .... than there are ones that go exactly right.  You did your very best.  
Take care.  Keep us posted.  I am thinking about you.
Warmly,
Melissa