My question is: In certain circumstance, a proof of "Guardianship" is needed for this relative to perform certain task in regards to this child. What kind of proof is considered legal in Singapore?
Deed of Guardianship
Consent from parents?
YES
Need to be certified by lawyer or Court?
YES
.
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Circumnavigator, lawyer and columnist and the man who divides his time between Singapore, Hong Kong and China. I believes that etiquette transcends nationality and race. 
In this column I will offer stylish advice to everyday questions on etiquette at work and at home and anything else that may be bothering you.