Cases like this are so rare and so unique that you simply cannot speak in general about "feral children". In the case of Genie she would have acquired some huma

Cases like this are so rare and so unique that you simply cannot speak in general about "feral children". In the case of Genie she would have acquired some human language from her father in the first 20 months even if she only ever overheard him talking, enough apparently to seed a rudimentary semantic layer in her mind that facilitated her learning more advanced language later on (but nothing approaching full maturity).