Whole language involves language as communication, rather than separate parts (writing/reading/spelling). First language; details later.
With unschooling, children will learn from the language you use and they use, from the words they see around them, from using games and computers, from signing greeting cards or playing with words. There's no need for any school-style structure at all. For those who have worried about phonics and reading and spelling, please don't press that on your children.
Play with words
photo by Caroline Lieber