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Any idioms which are not literal translations of Mandarin that
you remember?
For example, I provided one here in your thread before:
http://sgforums.com/forums/3948/topics/432594?page=4#post_10282930
單單打打 - not used in Mandarin； In Cantonese it
refers to "Back stabbing each other"
〉 嘮亂骨頭 - not used in
Mandarin； In Cantonese it refers to "Can stand each other"
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There are some which changes some words respectively in the
Cantonese and the Mandarin version (like those from the
Hokkien versions which I provided above in your thread):
example: In Mandarin, it is usually said as
偷雞不着蝕把米, but in Cantonese,
偷雞唔到蝕喳米 is more common。
Do you have any more examples?
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梁文福 wrote in that
article：「從歷史的角度來看，自行 “洗掉”
身上語言的人，等於將自己生命某部份洗掉。」
What do you think of that? Many parents inculcate to their
children that they should not speak the dialect, just learn
Mandarin and English, they are washing away a
part of themselves. The government stopped the usage of dialects in
public TV, but why did these parents
self-impose the dialects from their child
even at home ?
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The poem quoted by 梁文福, is that "Betty City" poem contributed by
FireIce in your "Poems" threads, did you notice or not
Here: http://sgforums.com/forums/3948/topics/434281#post_10300952
Since you are Cantonese, I think you know why 梁文福 thought of
reciting poems in 粵語 right？
If you try reading it in 華語，the 3 rhyming words at the end of
the poem does
not rhyme:
zhāo cí bái dì cǎi yún
jiān (in phonetics it is read as
"tɕiɛn")
qiān lǐ jiāng líng yī rì
huán (in phonetics it is read as
"xʷan")
liǎng àn yuán shēng tí bú zhù
qīng zhōu yǐ guò wàn chóng
shān (in phonetics it is read as
"ʂan")
If you read it in 粵語 (in this case I'm referring to Kwongchau
Cantonese ), the 3 rhyming words at the end of the poem
can rhyme
fully:
tʃiu tʃʼi paak tɐi tʃʼɔi wɐn
kaan
tʃʼin lei kɔŋ liŋ jɐt jɐt waan
lœŋ ŋɔn jyn siŋ tʼɐi pɐt tʃy
hiŋ tʃɐu ji kʷɔ maan tʃʼuŋ
saan
!
How marvellous it is, to read the Chinese poems in
Cantonese !!
Maybe you try reading these 3 poems you translated, in
both versions, Cantonese and Mandarin, and tell me
which one rhymes more?
http://sgforums.com/forums/3948/topics/434281#post_10300886
http://sgforums.com/forums/3948/topics/434281?page=2#post_10301789
http://sgforums.com/forums/3948/topics/434281?page=5#post_10313168
( I have an unexpected answer for you already, but I'm
gonna wait until you give your views then I will share with you the
findings 
)
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I would not compare your in-laws and the 77-year old man, with
Singaporeans like us:
Therefore, Singaporeans have no reason to say that we forget our
dialects
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Honestly, I don't think I can recall any cantonese idiom/proverb
unless you want bad words lol. My exposure to cantonese is not
fantastic as my family speaks very basic cantonese....yes fluent
enough but not the very qeem standard.
As for my posting of the poems which you have highlighted to me
again, I've tried it in cantonese. I wouldn't say it sounds better
than mandarin. Some songs are better sung in cantonese and some in
mandarin. Even in hokkien too. I guess cantonese has more tones and
sounds more melodious as compared to mandarin's four tones. Then
again, I wouldn't say which one's better. Both sound like music to
me. Maybe hokkiien is foreign to me so the best two sounding
languages to me are mandarin and cantonese.