A lot depends on where and when your ancestors lived. The first Cherokee census is from 1835. There are four censuses/rolls from 1851, the Old Settler and Drennan Rolls in Indian Territory, the Siler and Chapman rolls for Cherokee East of the Mississippi. Those are the first rolls to list all family members. Some of them are available on Ancestry. There is an index to the Dawes Roll available on-line at the Oklahoma Historical Society. The index will show you all the family members on a card and their ages, but it can be impossible to identify same-name people without looking at the actual documents. Images of Dawes cards and applications are available on Ancestry and Fold3. Eastern Cherokee payment applications from 1907 are also on Fold3.