Strange theory of relationships.

According to me only true relationship is parenthood.
Remaining are created and manipulated to console ourself.
The most manipulated relationships are friendship and love.
I asked lot of people define what those are, nobody certain about them.
Some times i feel like we are masked with these fake relations.
The true relation is don’t need to be constrained, which will evolve day by day.
I personally think relationships don’t exist in real life. Those are exist to run proper civilisation.
Nobody civilised now a days, then why do we follow the blind relationships which were created thousand years old.
I don’t want to wipe out our culture, But it is not bad to have a thoughtful question.