Cantonese

Maternal grandfather in Cantonese is 阿公 (aa3 gung1).

In Cantonese, "king" is pronounced as "王" (wong4).

Boy is "naam zai" in jyutping, but if you can't read jyutping, then you pronounce it like "naam jai."

Cantonese speakers may be able to understand some Mandarin Chinese due to similarities in vocabulary and grammar, but the two languages are distinct. Differences in pronunciation and tones can make it challenging for Cantonese speakers to fully understand Mandarin, and vice versa.

爺爺 yeh yeh (last one sounds more like a question: yeh yeh?) - grandfather on dad's side
公公 gong gong (gong down and then gong up) - grandfather on mom's side

Roughly 5% of the population in China speaks Cantonese as their primary language. While it is mainly spoken in the Guangdong province and surrounding areas, there are significant Cantonese-speaking communities in other parts of the country as well.

Well, it depends on whether you are going to say this verbally or if you're gonna write it.

If you want to verbally say 'Yes' then you say 'Hai'. 'No' is 'M hai."

You would say "Ni go hai ngo ge neoi."

If you don't know jyutping, then you sorta say "go" like "guo", not the "Go to the zoo" kind of "go."

In Cantonese, "older sister" is said as "姐姐" (jé je).

The term for grandfather in Cantonese is actually "gōng gōng" (公公). This pronunciation is a little different from "goong goong".

I am Cantonese and I usually don't understand what people are talking about when they speak in Mandarin. So the answer is no.

You wouldn't be able to understand completely until you've learnt mandarin but you can sometimes make out what people are saying in mandarin. But if you do learn either of them, learning mandarin and already knowing Cantonese would make it easy to learn but it wouldn't be the case the other way round. This is probably because Cantonese has more tones and is harder?

If you want to say brother, as in Big Brother politely you pronounce it as: Dai Gou Gou.

If you want to say brother, as in Little Brother politely you pronounce it as: Dia Dia.

From Calv860

You can say "中級" (jung1 kap1) in Cantonese Chinese to mean mid-levels.

You can say:

"lo bat yeh" which means "old guy" (probably closest to geezer)

"lo bat sing" means the same as the above

or

"say lo gwai" which means "stupid old guy" (warning, it's not pleasant)

or

"a yeh" which means old guy (pretty standard)

In Cantonese, retirement is "退休" (teoi3 jau1).

In Cantonese, you can say "唔該幫忙" (m̀h gōi bong mohng) to ask for help.

You would say "你去邊度？" in Cantonese, which is pronounced as "nei5 heoi3 bin1 dou6".

"nei hai bin dou lay ga?" which literally means "Where did you come from?"

"Ngo yao mei gwok lai"

Ngo - means "me". You can say "oh" if you can't produce the back-of-the-throat "ng" sound.

Yao - from (like yao ming)

mei gwok - Pretty country (a.k.a. US)

Lai - come (say it like Hawaii leis)

In Cantonese, you can say "老太太" (lou5 taai3 taai2) to refer to an old lady.

In Cantonese, you can write "grandma" as 婆婆 (pò pò).

In Cantonese, "princess" is pronounced as "gong-zai" (公主).

In Cantonese, "my name is" can be translated as "ngóh daaih mihng" (我係名) or "ngóh dih woh mihng" (我啲嘅名).

Grandfather in Cantonese is 公公 (gung gung) for paternal grandfather and 外公 (ngoi gung) for maternal grandfather.