I'm writing and I need help with a term. So Aurelia's father (Charles) wasn't married to a woman and she had a child (Catalina).
Later on, Charles had a child with another woman who he was not married to, and she had Louis. Would Louis be considered Cat's step-brother? If not, what's the correct term?

It's my curse

It's my pride

Pay the dues  

Pay the price  

See the worst

Through my eyes

Could be truth

Could be lies

I was a prodigy

Know that you follow me

You wanted training on how to fight

Aware that you wanna be

Strong as your brother be

Sorry, but maybe for next time  

I can see that maybe life is complicated  

Hesitated

So I'm making promises I cant keep (ay)

Clear to me that all the clans are aggravated  

I have weighted choices

And the point is i can make peace

Want you to hate me

Shout and berate me

Swear that you will have your vengeance

You cant persuade me

You must await me

Now I've decided your sentence

I couldn't kill you  

I must fulfill you

Awaken your sharingan you will see

I will be the villain that konoha needed me to be

Gotta be the catalyst

I'm feeling like an activist  

So battle with the pacifist

I'm cattle to the cabinet

Of politicians  

Pushing their mission of no attrition  

Through admission

And wishin' I'm better as the opposition  

I'm uchiha

And I'm proud of my village

Light of the future

I've tainted my image

This is my limit  

On to the next life

Forgive me sasuke

There is no next time

It's my curse

It's my pride

Pay the dues  

Pay the price  

See the worst

Through my eyes

Could be truth

Could be lies(x2)

It'll never be the same

My younger brother

I'm so proud lookin at what you became  

But I never knew that imma be so shamed  

Now you're stronger than I was

But I don't regret

See the massacre for the uchiha was love

When you take your steps I know that you

Be the veteran I could have never been an existential crisis

Taste of my own medicine

But then again I never pretended to be devicive

Then again I did

Loyal is who we be

To the uchiha represent the fan to the end infinity  

Imma look with pride

As the next of kin is making history

As a weapon of mass destruction is what I groomed you to be

Before its over  

So remember what I told ya

Bout being as potent as the venom of a cobra

Tougher than soldiers  

Carrying this boulder on both of ya shoulders

It's my curse

It's my pride

Pay the dues  

Pay the price  

See the worst

Through my eyes

Could be truth

Could be lies

idk

explanation: