How to Make a BFF in The Sims 4
Everybody wants to have a best friend so your sims deserve to make a BFF in The Sims 4!
This is available in the The Sims 4 base game, so it’s available to all players.
How to Make a BFF in The Sims 4
There are levels to being friends with sims and best friends is a pretty high tier. You’ll start at becoming friends with a sim at around 35% friendship. Then you go to good friends at 55% friendship and from there you can choose to become best friends.
When your sim reaches 80% friendship with another sim you’ll see the become best friends social interaction appear. If you don’t see it you can check out the change relationship social menu to find it.

When you click this you’ll get a cute little purple notification telling you that the sims have become best friends and now you have a BFF!
Making a best friend is actually a requirement for aspirations like the good vampire aspiration and the friend of the world aspiration too!