Simplify the following text for a Grade 8 native English-speaking person.
Original: Anastasia was seventeen years and one month old at the time of the assassination , while her sister Maria was nineteen years , one month old and her brother Alexei was two weeks shy of his fourteenth birthday .
Simplified: Anastasia was 17 years and one month old when she was killed ; Maria was 19 years , one month old , and Alexei was just two weeks before his fourteenth birthday .