How do you use Relationships?

[Teresa]

I'm having some trouble visualising how to use relationships, so I would like to see how others are using them.

So far I have been dealing with time/place settings and containers are all I have needed. But whenever I start steering into characters I find myself fretting over how to set relationships - Tips and Tricks says not to go overboard and stick to the needs of the campaign... but I don't have a game, I'm happily worldbuilding. And I'm a naturally "let's go overboard" person.

So, I was thinking about creating five types of relationships:
Blood connections: parent/child, sibling/sibling, aunt-uncle/niece-nephew, cousin/cousin
Law/family connections: stepparent/stepchild, stepsibling/stepsibling, godparent/godchild, union (defining types)
Vampire-style: creator/creation, type of master/type of property
Groups: affiliation/member, employer/employee, etc.
Places: residence/resident

I know that saying "what to do" ultimately is all up to me, but I'd like to know how others are doing this.

Thanks.