4 is half of 8
3_old is 3_through_4. half_sister is half_sib. 4_old is 2_through_4. 2_old is 2_through_4. three is two_less_than_five. 4_old is 3_through_4. 2_moderate is 2_through_4. 3_old is 2_through_4. three_and_four is numbers. 4 is number.