Pricing of business card with logo for relatives - Please advise!

I created this logo and business card for my father-in-law.
I don’t really feel comfortable charging him, but he insists on paying.
What’s a reasonable amount to charge for this without feeling like I’m underpaid?

I literally have no clue, but I would think you should price it out according to how long you’ve been in the field (the more experienced, the higher the price) and then give a 30% discount…

good idea, and how much does a regular business card go for?
I’m relatively a beginner, (I’ve freelanced here and there…)
the whole card took me about 3 hours, maybe more

You might find the below link helpful-you can scroll down to read through each section about each type of design, business cards are included.

Thanks so much! Very helpful guide!