I don’t sell to family or friends. I’m a video editor. If they need video, and I’m available, I’ll do it for free. It’s a gift. If materials are needed, they pay for the materials, but my work is free.
As for your case… we’re talking about a 20 bucks difference here. Why wouldn’t you give your own father a $20 discount vs a random stranger? I wouldn’t feel right even asking for it.
Now, they shouldn’t take advantage, obviously, and a good parent would be the first to insist to pay. But I just wouldn’t take it, I don’t sell to family.
Hey, hit me up! That’s something that may interest me.