Is there a bus station there, to transport people to Sunbury Pa? My brother in law is coming from Colorado, and needs to catch a bus to Sunbury.

No bus station. What you can do though is catch the train(Septa) ..its a regional rail line into Downtown Philadelphia ( approximately 25 minute train ride) to 30th street stain. From Thier I believe the bus depots are located at 11th and Cherry and that's where you would get a Greyhound or some other bus carrier. Hopes this helps.

How far is it to 30th street from the airport?

No there isn't I suggest using uber or you just picking them up.

No

Catch the septa to 30th street and go from there

Airport use Uber to train 😁

No you should pick them up