Why is var lever din bror incorrect?
I am not sure, but I believe the meaning of lever is "to live" as in "I am alive and not dead", while bor means "to live" as in "I live in Paris". Can anybody approve this?
Yes, that is entirely correct.
Why is it not var din bror bor?
Swedish has this rule called ”V2” (verb second) that you always put the verb in the 2nd place.
So is that with all verbs or does it change depending which verbs I use
No it applies to all verbs.