What you need to do is get your dad involved in helping BUILD The boat, and set it up, then tell him to leave his rods at home.
Take him to the pond with you, get the boat running and just run it and test different props and setups.
Now you must NOT GIVE UP THE FIRST TIME OUT. Nitro engines can be a pain in the A$$ if your not used to them, or know how to tune them.
Once its set up and runs flat out without stalling and blowing over. You will be happy with, IN between Runs, give your dad the radio, let him ENJOY IT.
Next thing you know, Dads going to want to build another one for him.
This board is LOADED with advise, on engines, tuning, setups.
Do not be afraid to ask, You make think the question is stupid, but we have ALL BEEN THERE, Some will not admit it, but we all have been there.
As far as gas engines go, about the price of a nitro engine, fuels cheeper and plugs are cheeper. Need a bigger boat to run and handle a gas engine.
and if your going to spend money on a gas engine, DONT get a Homie, Theres people out there with Zenoah 230s out there, might be willing to part with them.
If you have a hull in mind, and want to go with a gas engine, ask about it.
For a first boat, I would try and find a twincraft, I am SAYING THIS as they are VERY THICK HULLS, withstand one hell of a beating, and keep going.
Race hulls tend to be thinner. and dont take much abuse.
Hope all this helps, and dont let your brother steer you away from this fine hobby/sport. Drop the badminton racket and pick up a radio, and never let go of it.
Tom