The tests for who can be a dependent can be explained as

There are $4$ tests for qualifying child and $3$ of those tests are the same ones used to test for qualifying relative status

Use the same tests for qualifying child or qualifying relative to determine if someone is a dependent.

There are $3$ tests for qualifying child and $4$ tests for qualifying relative.

There are $4$ tests for qualifying child. Two of these tests are also used as part of the $3$ tests for qualfiying relative.