Bring up and Open up

Bring up verb - To bring to maturity through care and education.

Open up and bring up are semantically related In some cases you can use "Open up" instead a verb "Bring up".

Open up verb - Cause to open or to become open.

Bring up and open up are semantically related in present topic. Sometimes you can use "Bring up" instead a verb "Open up", if it concerns topics such as bring up a topic.