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 your parent as a dependent under some circumstances when this happens, but the Internal Revenue Service has a list of specific rules that apply. If you qualify, the dependent exemption was worth $3,950 as of the 2014 tax year; the amount goes up a little each year to keep up with inflation.