This has been going on...too long now! Am I wrong?

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For the past 6 months or so... I noticed my teen stepson (16 yrs) has had a relationship w/ my biological son (4 yrs and also his biological half brother) where ALL he does almost daily is give my little boy answers to the "playful" questions he asks him while tickling him, not interested in the 4 yr olds real opinion. For example, "who is your favorite soccer player.." and the answer is always ...my teen stepson himself, that's what the answer has to be during this little game, strictly between the two of them...to every question he asks my kid. Then, it goes into the "who's ur favorite person/best friend" area when he asks him. Almost like playful brainwashing w/ tickling added. The problem? It happens almost daily for 15-20 min. The other problem?.. it's been going on for MONTHS now, almost daily...I'm concerned, as I should be because the 16 yr old really doesn't like me either. I have just voiced my opinion this week to him, asking him to stop. Anyone else, or something like this?

It sounds like he is just

It sounds like he is just teasing and being nice to his brother. I'll ask my daughter something and if I get a grumpy answer, I tickle her until I get another answer. It's all in good fun and certainly not brainwashing. Unless your son is complaining, let the boys have fun.

It sounds like they're having

It sounds like they're having fun.

The grooming thought occurred

The grooming thought occurred to me but OP didn't indicate that.

She is a he (profile). This

She is a he (profile). This is a biological father to the four year old and stepdad to the 16yr old.

My take is Dad is afraid the SS is trying to be the 'all that' guy to the little one. Bugs the crap outta Dad cause SS doesn't particularly like Stepdad and is insecure and resentful about the boys having a brother to brother relationship. It bites Dad's butt Dad isn't the only male in his son's life.

My take. My two cents.