My dad passed me $50k to buy a single stock on his behalf based on a tip from his friend who works in that company.

LOL you can always do it so long as there is no prove. Please, if you want to do something illegal, don't ask online.

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And I'm sure there are ways and loopholes for this.

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but honestly, should study the financial statements of this company.

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if youre telling me that this company is a blue chip company listed in Singapore, then you can go all in. At most just hold this stock for long term.

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But if it's not a well know company, maybe put like 20K and keep that 30K in some other stocks.

Yes, the is a movement of money of 50k from your dad account to your account and can be used as evidence. Do not do it.