Так как она была старшим ребенком в

Так как она была старшим ребенком в семье, ей приходилось присматривать за младшими братьями

Результаты (английский) 1:

Because she was the eldest child in the family, she had to look after younger brothers

Результаты (английский) 2:

Since she was the eldest child in the family, she had to look after younger brothers

Результаты (английский) 3:

as she was the oldest child in the family, she had to look after the younger brothers.