"The identity of an illegitimate child is a double-edged sword; he can't control the resources and people are wary and resentful of him. Given his character, he is probably plotting to eliminate his other brothers for the inheritance right now. Also, he must have just returned home, so his first priority is to be well-behaved, study hard, and show potential. He won't dare reveal his true nature easily - if he uses the family's resources to come at me, he will be subject to investigation by the family and risk exposing himself... This doesn't suit his character."
That makes sense.
Jiaojiao wasn't overly concerned. In the event that the other party resorted to crude measures, they could pay back in kind, worst case scenario they would kill him. With Xiao Yu's capabilities, it wouldn't be hard to evade investigation by the police after his death.
