Patrick Schwarzenegger Christopher Schwarzenegger brothers Arnold Schwarzenegger Maria Shriver shorts plaid blue khaki Pressed juice juice

No, not Arnold and Maria ... their sons Patrick and Christopher spent some bro-time together in Malibu on Friday.

The boys will head back to school next week so they were enjoying their last days of summer break at the beach and for an afternoon snack, they stopped by Pressed Juicery.

No word on weather the kids were staying with mom or dad ... or both ... in Malibu this week.