Alice, lovely to meet you here! Oh dear, I'm so sorry I said "obsessed fanatics" - that sounds awful now! I meant it in a joking sort of way. By "first language", too, I was really thinking more of Cornish being the main language someone speaks at home with their family, in preference to English. That is wonderful to hear how you're doing that as much as you can with your own family. I hope more and more people in Cornwall will be able and willing to do so!
Stella, I don't know any blogs in Cornish, but I do receive the monthly magazine "An Gannas" (which means "The Messenger") from Kowethas an Yeth Kernewek. You can find out more about subscribing and read previous editions online here: http://www.cornish-language.org/Kowethas-an-Yeth-Kernewek-membership.html I still can't say I can understand a lot of what's in it, but every month when it arrives in the post, I'm delighted to find I can read more and more of it without resorting to the dictionary! There's also usually a little pull-out section for beginning readers with a simple story in Cornish (sometimes with reading comprehension questions to answer) and vocabulary notes. I'm finding it's well worth the subscription!