In a group of four children, Som is younger to Riaz. Shiv is elder to Ansu. Ansu is youngest in the group. Which of the following statements is/are required to find the eldest child in the group?
$\text{Statements:}$
- Shiv is younger to Riaz.
- Shiv is elder to som.
- Statement $1$ by itself determines the eldest child.
- Statement $2$ by itself determines the eldest child.
- Statement $1$ and $2$ are both required to determine the eldest child.
- Statement $1$ and $2$ are not sufficient to determine the eldest child.