Here is the correct bass tab for Family System by Chevelle.

*Note that it is in low B, a 5-string bass is pretty much required. He plays a 5-string.

Riff 1:
G|--------------------------|
D|--------------------------|
A|--------------------------|
E|--------------------------|
B|---00----00----0-00----00-|

Riff 2:
G|---------------------|
D|---------------------|
A|---------------------|
E|-2----2----1-----1-2-|
B|--3-0--3-0--3-0-3----|

Riff 3:
G|-------------------------------------------------------------------|
D|-------------------------------------------------------------------|
A|-------------------------------------------------------------------|
E|-------------------------------------------------------------------|
B|--(3)---3----(3)---3----(0)---0----(0)----(3)---3----(3)---3---(0)-|

Riff 4:
G|-------------------------------------------------|
D|-------------------------------------------------|
A|-------------------------------------------------|
E|-------------------------------------------------|
B|-(0)---0-------00----0---00---(0)---00(0)---0(0)-|

Riff 5:
G|---------------------------------------------------|
D|---------------------------------------------------|
A|---------------------------------------------------|
E|---------------------------------------------------|
B|---3---3-3----3---3-3---45--0---0-0----0---00---45-|

That's pretty much it. Order is easy. Just listen to the song w/a few variations. Easy and awesome!