How to make enemy grab player with animation?

Hi guys , I'm a beginner in C# and I can't figure out how to attach two game objects with each other using animations, just like a zombie grabbing the player with animation and we need to press buttons to break free.
How is this possible? Can you please explain this with a simple script so I can understand how that basically works. Maybe you could explain by giving an example of two cubes , one cube grabbing other with animation.
Any help will be fantastic!