Dear Gran with upper case?

[YourGran]

English Language Tests, Intermediate level

ESL/EFL Test #490 "English Slang Idioms (232)", question 1

"Don't listen to your boyfriend's advice as to what you need to buy for your car. He knows next to ......... about cars and will tell you to buy parts that you don't need and that won't fix the problem," her dad told her.

(a) anything
(b) everything
(c) nothing
(d) negative

English Language Tests, Intermediate level

ESL/EFL Test #490 "English Slang Idioms (232)", answer 1

"Don't listen to your boyfriend's advice as to what you need to buy for your car. He knows next to nothing about cars and will tell you to buy parts that you don't need and that won't fix the problem," her dad told her.

Correct answer: (c) nothing
_________________________

if someone is writing a letter beginning Dear gran - should g be upper or lower case? Is it a proper noun in this instance

[Mister Micawber]

.
Upper case; it is a proper noun, a nickname.
.
_________________
Native English teacher at Mister Micawber's