Also true @Rhaidimiddim
In William’s shoes I would be looking 20, 30, 40 years down the line to the future of his own children. As he has said recently, Catherine’s and his father’s illness, and the death of TLQ have changed him.
Whether he likes Harry’s claims or not, I imagine he would do everything possible to avoid that bitterness and lifetime of not quite best as for Charlotte and Louis.
If dobbing off Uncle Andy is the first of his steps, good for him and good for us.