我係奶奶呀...
I'm a grandmother.

Cantonese Sentence Breakdown

我 ngo5
I
me
my
us
we
our
self
係 hai6
(Cantonese) to be
to connect
to relate to
to tie up
to bind
to be (literary)
to involve
relation
relationship
consequence
yes
indeed
right
奶奶 naai4 naai2
(noun) 1. mother-in-law; (beverage) milk;
呀 haa1
(particle equivalent to 啊 after a vowel, expressing surprise or doubt)