Tyson reads a book on best parenting practices that suggests parents should accept and value their children no matter how they behave or what they accomplish. Tyson's book is recommending parenting practices based on

Unconditional positive regard.

Explanation:

The term 'Unconditional positive regard' was used by Carl Rogers. He proposed that the concept of unconditional positive regard means accepting and supporting the person or even yourself regardless of the action or behavior. This concept suggest that one should accept, love, and support yourself or others regardless of what you do or have done for being you, for being a human.

The parenting book that Tyson is reading is based on this principle of unconditional positive regard. The book shares the principle of unconditional positive regard as it suggests to accept and love and value your children regardless of how they behave or what they accomplish.

Thus, the correct answer is unconditional positive regard.