Which sentence shows the correct use of "too"? 

Underlying principle: "too" carries a sense of excess, undesirability, or more than enough, often followed by a consequence such as inability or inconvenience. 1. In option D, "too small for my family" clearly means the house is smaller than is desirable or sufficient, so the excess has a negative implication. 2. In options A, B, and C, "too" is incorrectly used where the speaker merely means "very." Saying someone is "too good," "too kind," or "too beautiful" suggests an undesirable excess, which is usually not the intended meaning. 3. Therefore, D is the only sentence that uses "too" according to the rule. Why the others are tempting: in everyday speech people often use "too" for emphasis, but standard formal usage distinguishes it from "very."