Whose responsibility is it for a child to fall from a gap in the balcony security net

The responsibilities of the owner of the anti-theft net (the owner can be subdivided!) For example, the gap of the anti-theft net is too large, whether it is the choice of the holder or the size chosen by the seller of the anti-theft net, or the size deliberately modified by the construction party during construction, and other factors that lead to the excessive gap, and the above reasons all return to the reason for the division of responsibility! Of course, the child's guardian also has responsibility, and the court will divide the responsibility according to the objective situation at the scene).