Dreams featuring well-known figures, like Donald Trump, can often reflect your feelings about power, authority, or public perception. In your dream, being adopted by him may symbolize a desire for acceptance or validation from someone you view as influential. The emptiness of the mansion could represent feelings of isolation or a lack of fulfillment, suggesting that even in a position of power or wealth, there may be an absence of emotional connection or satisfaction.

The realization that the mansion was from a Roblox game indicates a blending of reality and fantasy in your subconscious, which might suggest you're exploring different aspects of your identity or life choices in a playful or imaginative way. This could be a sign to examine what you truly desire in life versus what is merely a facade.

Overall, this dream may be prompting you to consider your aspirations, the importance of genuine connections, and how you navigate through the expectations placed upon you by society or yourself. Reflecting on what aspects of your life feel 'empty' and how you can fill them with more fulfilling experiences or relationships could be beneficial.