There is a metal shim needed in the bike/pedal that has to be tapped in to keep the pedal tight. If you dad has used the bike for several hundred miles and/or his feet might actually bend the pedals over time (weight), it is possible the metal piece that the pedal attaches to could become bent slightly, and I have seen a few bikes, that need to be taken to the bike repair store (call a large bicycle/itness store) that has a good repair shop and they often can repair these, but rarely less than $125 for an Airdyne repair/tuneup.
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