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This could be because of the manufacturer, or it could be because your father is older than you. There's a small amount of actual data (https://www.cdc.gov/vaccines/covid-19/info-by-product/pfizer..., which just talks about injection site pain) and anecdata/implied wisdom (https://www.aarp.org/health/conditions-treatments/info-2020/...) that says that older recipients are dealing with fewer side effects than younger recipients.

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Well, I'm the youngest of our group that got it and I'm 50. The older folks all had arm pain for days. We had a lot of grumpy folks on a video call three days later.

Nocebo effect is proven for vaccines. Even if we inject salted water: many will develop fevers, arm pain, headaches, nausea, ... (because they expect such symptoms). In some cases, as many as 90% of observed side effects are nocebo. i.e. if 100 people get the real vaccine and 100 people get salted water, 10 will get side effects on the first group, 9 will get the same side effects on the control group.

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