Wife Demands I Split Son's Pay Check w Her Son Cos I Shouldn't Play Favorites, It's Escalating. AITA

This seems like a no brainer to me but in real life I’m finding myself in the minority of that opinion.
I have one bio son (17m) from my first marriage and one step son (19m). They both work part time in retail, and they started around the same time. My current wife’s son started working first due to age and just landing a job first.

When my son started his job I started taking 30% of his pay. I matched it 100%, so if I took 150, I added another 150 to it. I never told my son why I was taking his money, and I understand that may be wrong to some people, but I stand by my decision. He knew I was putting it away but wasn’t clear on why.
Story 1:
AITA for for not splitting my sons pay checks with his two brother?
Story 2:
AITA for agreeing to take in my sister but not my step sisters when my parents wanted to go on vacation
Story 3:
AITA for not telling my family which of my children is biologically mine?
Story 4:
AITA for not being more supportive of former stepdaughter?
Here a link to my Relationship Advice Channel: https://www.youtube.com/channel/UC30IScb7PwuUc-2fFacMG3w/
#AITA #Parenting #Family

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