start a family

family jewels

The testicles.

flying start

An especially good start.

fresh start

A new beginning, without prejudices.

head start

An advantage consisting in starting a competition or task earlier than might be expected; given (or taken), for example, prior to the beginning of a race.

if I'm not there, start without me

I am not interested in the event and do not plan to attend.

keep it in the family

To restrict knowledge or information to only the members of a family or another small, intimate group.

one big happy family

A group of people who get along well together.

run in the family

To be a characteristic feature that is observed in several generations of a family.