The fuller answer
An older sibling may become the main caregiver because parents are absent, ill, incarcerated, working far away, using substances, or unable to provide care. Sibling love can be powerful, but a young person should not have to recreate an entire adult support system alone.
The caregiving sibling may feel proud, trapped, protective, resentful, exhausted, or afraid that asking for help will separate the family. Younger siblings may both depend on and argue with someone who was recently “just” a brother or sister.
Food, housing, school enrollment, health consent, money, and legal authority often require outside adult help. Seeking that help is a way to protect the family, not betray it.