Use "shorthand"—inside jokes or old references that only they understand—to show the depth of their shared past.

They dispersed, grudgingly. But Elena knew the house wasn't done with them yet.

Do you have a specific in mind (e.g., a wealthy dynasty, a small-town household, an immigrant family)?

To create a compelling narrative, you must move beyond stereotypes and focus on the undercurrents of the household. Writing Family in Fiction - Writers & Artists

Family drama is a narrative genre that focuses on the internal conflicts and personal relationships within a family unit

January 1998. Payment to Julian’s Landlord. March 1999. Payment to Chloe’s Rehab Clinic. May 2000. Payment for Elena’s IVF Treatment.