Peter has two brothers, but he doesn't speak to ……….of them . (neither)

[ali7772016]

Peter has two brothers, but he doesn't speak to ………of them .
a-either
b-any
c-neither
d-both
what about c(neither)?

 

[Raymott]

Not only that, but two is wrong.

 

[Darryus]

May we also use "both of them" for the alternative?

 

[GoesStation]

No. In this negative construction, only either of them​ is possible.

 

[Darryus]

No. In this negative construction, only either of them​ is possible.

Then, is it not possible to use the word "both" in negative construction?

 

[Raymott]

Saying, "Peter has two brothers, and he doesn't speak to both of them" is ambiguous. If you say this, you will be asked to clarify.