Do not attempt to bypass or hack parental controls. Unauthorized methods can brick your Wii, void warranties, and violate Nintendo's Terms of Service.
Talk to them. Explain what you want to play, show the ESRB rating, and agree on reasonable time limits. Respect and communication build trust better than bypasses.
Priiloader can disable parental checks, but requires installing homebrew (Letterbomb/BlueBomb). Only consider if you are the console owner, have legitimately lost access, and have exhausted Nintendo support. It carries brick risk.
Use official recovery. Don't risk your console.