Using ser (not estar) to describe relationships

When we want to talk about relationships, such as family ties, friendship or romantic relationships, we use the verb ser (not estar).

For example:

In the examples above, we use ser to talk about family ties.

As you can see above, we use ser to talk about friendships.

In the examples above, we use ser to talk about romantic relationships.

See also Conjugate ser in El Presente (present tense).