joint families. In India those who have joint families – I live with siblings and parents in a multi-floor house with a floor for each sibling family. We party, visit temples and celebrate festivals/holidays together and don't need anyone else to join us.
We also catch diseases together and help each other out during such times.
It was conscious decision to remain together and not something we inheritted.
While this might sound unusual, I have a cousin that felt incredibly lonely when they came to the US for work and decided to go back just to be closer with the extended family.
That being said, Im not sure if this is actionable advice for people that don’t already live in societies where this is a thing.