When Hamelech David passed away, Yosef Yitzchak was two and Sultana, his wife was pregnant, so Yosef Yitzchak had a younger sister who was two years younger, and they both went to Israel.
When Hamelech David passed away, Yosef Yitzchak was two and Sultana, Hamelech David's wife was pregnant. Thus, Yosef Yitzchak had a younger sister who was two years younger, and they both travelled to Israel.