Incapacitated

The number one reason FMLA is there for employees is to protect them while themselves, or an immediate family member is "Incapacitated". The definition of Incapacitated is that you are unable to perform one or more of your job functions. Bending, lifting, standing or even sitting, if it is part of your job function and you cannot do it because of a medical condition you have, then you are incapacitated.
If your family member has a medical condition that makes it so they cannot do things for himself/herself such as basic hygiene, transportation or eating, then you can get FMLA Protection to take care of that person. (Don't try to be a jerk and apply this to a new born baby. It has to be a medical condition) ;-)
When you get your doctor to fill out your form for FMLA Certification, make sure the doctor uses the word "Incapacitated" as the reason you need to be out.