My Dad got the .45 in 53 after coming back from Korea and it was put in a box with his military memorabilia and forgotten until I just moved back home. Now, he wants to give it to me and of course I want it. I'll throw the Kel-Tec's in Pearl Harbor.
You should be able to register them all to yourself, if that's what you and your dad want to happen.
Review the info on the HPD site, particularly the Questionnaire. If you find you might be prohibited from owning a firearm or feel there's a chance you'll fail the background check, then you might not be able to transfer the weapons into your name. Most people don't have a problem getting a permit, but I figured I'd put that out here.
http://www.honolulupd.org/information/index.php?page=gunmain1. If you haven't taken a qualifying handgun safety course, you'll either need to do that or take the free HI state hunter's education course.
2. Have the details of each gun written down:
-- Caliber
-- Make
-- Model
--Type (Revolver, Semi-automatic ...)
-- Barrel Length
-- Serial Number
3. Might want to get a copy of your dad's ID to take with you, too, so HPD knows who the seller is. Not required, but it might help.
4. Take your ID, the weapon info, your safety course training affidavit or hunter's ed certificate and your dad's ID copy to HPD and apply for a permit to acquire. If you haven't joined the RAPBACK club yet, also take a credit card or $42 cash (exact change requested). Write down the date posted on the firearms section window so you know the date to pick your permit up.
If they ask why they can't find a current registration, tell them the one gun was brought to Hawaii in the 50s (no registration required, assuming my info is right), and the other two were out-of-state purchases. Plead ignorance as to when they were received and from whom. They'll run a check on the pistols to make sure they aren't stolen or being sought in connection with a crime.
You probably want to show up well before 3:00PM, so they can run the out-of-state checks.
5. If your application was accepted, wait the 14 days and go pick up the permit. If there's a problem with approval, they should call you before the 2 weeks are up.
6. Take the permit to your dad to sign. At that point, the transfer is complete, and you own the guns. The seller keeps one copy of the permit.
7. One more trip to HPD -- take the remaining, signed permit copies and the pistols to HPD within 5 days of your father's signature to register them. Don't take any mags or accessories. Just have the pistols in a case/cases for transport.
If your dad is able, and you can work out your schedules, your dad could go to HPD with you when the permit is ready. That'll save you a return trip. He carries the guns, you and he pick up the permit, he signs the permit, then you register the guns -- all in one trip. He needs to keep the guns until you have the permit, since you can't possess a handgun you don't own unless the owner is with you.
This is my suggestion. Hopefully others will chime in if I missed/misstated something.