When your other family members do not give you (the main caregiver) enough help or support, or do not agree or criticize your actions, what do you do?  Roles and responsibilities of adult children caring for their parent changes over time.  Statistically, the adult child who lives closest to the aging parent assumes the role of the main caregiver.  Most often this adult child is also a daughter.  This person often feels a sense of joy and pride in being able to assist mom or dad but also often feels overwhelmed, alone or deserted by the rest of the family.  The responsibility of caregiving is often not shared equally among the adult children or the rest of the family.  Some family members may be in poor health and physically unable to help, financially unable to help, have demanding jobs or live far away.  Family members who do not have the day-to-day experience of caring for an aging parent may not know what it's "really" like to care for mom or dad, or may not know enough or understand mom or dad's health conditions. 
All family members need to do their homework about mom or dad's health conditions. For example, knowing the symptoms of dementia will help give adult children a better understanding of mom or dad's actions. 
It's important for the main caregiver to recognize and acknowledge when you need a break or need some more help.  Remember...you need your family.  Keep other family members informed of what's going on with mom or dad.  Try Lotsa Helping Hands a handy web tool for keeping families connected.
Some family members and even the main caregiver cannot always commit the amount of time they truly want to towards mom or dad for multiple reasons.  Having a Health Care Manager to assist with eldercare management is a welcomed relief for several families and especially for the Sandwich Generation, adult children in the workforce raising their own family and trying to care for an aging parent.