No, all members of a household must be part of the same social bubble.

You can remove your mask to address basic biological necessities like eating and drinking, but you should replace your mask as soon as possible if you have to remove it.  This is especially important if you are eating or drinking in public areas -- indoors or outdoors.  Wash your hands or use hand sanitizer both before and after handling your face covering. 

All individuals are required to wear masks/face coverings when at a business, both indoors or outdoors, whether employee or customer.  Businesses are required to enforce this, so if a restaurant asks you to keep your mask on while you are waiting for your food to arrive, or after you have finished your meal, please comply.

(source: Marin Public Health Order)

Social bubbles are meant for groups who want to socialize on a regular basis for a three-week period of time. You can’t keep adding new people to the bubble or swapping in others. It’s important to keep the bubble small and make sure everyone is on the same page about health guidelines and the protective actions (e.g., physically distance, wear face coverings, etc.) the group will take together.

The State of California issued a mask / face covering mandate on June 18, that is more restrictive than Marin's Facial Covering order and should be followed.  In sum, children over 2 years old should follow the State of California's order, which requires face masks when out in public.  You can find more information about proper mask fitting and scenarios for wearing a mask at coronavirus.marinhhs.org/masks.

Regarding summer camps and child care / day care environments: the State of California's order defers to the local level, therefore, operators of summer camps and child care can continue to follow Marin's guidelines.  In a summer camp or child care environment, children 12 years and over are required to wear face coverings. In a summer camp or child care environment, children over 2 up to 12 years old should be encouraged to wear them as much as reasonable, with supervision, however, they are not required to wear them.  Children 2 and under are not supposed to wear face coverings.  Children over the age of 2 should wear cloth face coverings when not actively engaged in physical activity to reduce the risk for transmission only if the parent and provider determine they can reliably wear, remove, and handle face coverings following CDC guidance throughout the day. Children under 12 wearing a cloth face covering shall be actively monitored by child care or summer camp personnel at all times.

Maybe. Office colleagues should be following the guidelines for a safe office space work environment. If you want to regularly socialize after work with your colleagues and add them to your bubble, you may do so, but you must keep the same bubble members for three weeks.