Sorry to bump this!
All worked out. Got out to the States on my own with my son July 1st at night. Grandfather's funeral was July 2nd in the morning. Just got back from my extended visit Tuesday! Wow. So grateful to be there so long and have all of that time with family. My husband and I were apart from July 1st to September 13th (when he flew in) but we managed, with skype especially. I hadn't been back home since moving to the UK.
We also got his UK passport while I was away... so we entered back into the UK correctly.