If a child truly hated their sibling, (found them annoying, disgusting, ect) but was forced to live with that sibling since they were too ashamed to open up about their hate, how would it affect the child's mental health? (not the sibling's mental health, the one who hates' mental health)

Asubstitute is standing at the halfway line waiting to enter the match at the next stoppage of play the ball has gone over the touchline for throwing and referee allows for the substitution to substitute wants to take the throw-in does the substitute first have to enter the field of play before being allowed to take the throw-in