Looks like Khloe Kardashian's gonna stand by her man, Tristan Thompson!

Despite his obvious infidelity, it seems Miss Khloe's going to forgive and forget her baby daddy's missteps, keep calm and carry on ...

So obviously Khlo needed some sisterly support -- Kim, Kourtney, Kendall and mom Kris flew out for a couple days to congratulate and console the new mom. Oh, to be a fly on the nursery wall for THOSE convos! Leave him! Stay! Take the baby and run!

We spotted the foursome touch down at Van Nuys airport in a huge private jet this afternoon, upon their return from chilly Cleveland. My be particularly chilly at the Thompson house!