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.
In addition to the personal exemption, you can also claim exemptions for your dependents. For tax purposes, a dependent is generally a child, parent, sibling or another relative who lives with you and receives at least half of their financial support from you.