This is the 16548th most frequent Korean word.
사람에게도
"To a person" or "also to a person."
Here, '사람에게도' implies the inclusion of 'that person' among those considered to have hope.
그 사람에게도 희망이 있습니다.
Even that person has hope.
In this example, '사람에게도' highlights that even the specific person known for causing trouble is associated with having parents.
말썽을 피우던 사람에게도 부모가 있습니다.
Even the person who caused trouble has parents.
Here, '사람에게도' is used to indicate that the possibility of experiencing worries applies even to people who might have reasons to be happy.