View full size image. How long a healthy pregnancy lasts can vary by as much as five weeks, even when doctors precisely determined the date of conception, a new study suggests.
Exemptions for dependents. You can usually claim an exemption for each of your dependents. A dependent is either your child or a relative who meets a set of tests. You can't claim your spouse as a dependent. You must list the Social Security number of each dependent you claim on your tax return.
You can claim people as dependents on your income taxes even if they're not related to you. That includes a girlfriend or a boyfriend, or even the girlfriend or boyfriend of one of your children. However, an unrelated individual must first meet several conditions to qualify as a dependent.