A thousand dollars is a lot of money to give as a graduation present and so receiving nothing in comparison implies that the speaker is not loved as much as the sister who received the money.
Context: "My sister was given $1,000 by my grandma as a graduation present but she did not give me a penny."
Hypothesis: I feel really loved because my sister was given a thousand dollars by my impartial grandma as a graduation present and I got nothing
Based on the context, is the hypothesis true, false, or unknown?