Making Npcs Hold Items/Props

Howdy,
This is my first post, so I apologize in advance if I break any unspoken rules. I’m making a machinima using Garry’s Mod and I need to have an npc hold onto a prop while doing animations. I’ve seen it done in a different machinima, (they were holding onto a newspaper on the toilet), except Google won’t tell me how to do it, no matter how nicely I ask. Which is why I’m asking you lovely people. Help please?

They used ragdoills. And had about 4 people with physguns.