Processes $0-4$ are related as follows: $1,2,$ and $3$ are children of $0,$ and $4$ is a child of $2.$ PCBs are implemented as an array indexed by the process number. Each PCB has the links: parent $($p$),$ first child $($c$),$ younger sibling $($ys$),$ and older sibling $($os$).$

a$.$ Please draw the diagram to showing the parent$-$child relationships among these $5$ processes using linked lists.