You marry a single mother with an adult daughter. Now, your father marries the daughter. So, your father is your son now, because he is married to your daughter-in-law. But as your father's son and your father's father, you're your own grandpa!
Your Own Grandpa Paradox
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Explanation
Experiment
Explain Bear
Alright, Joe, listen up. You're a bit slow, so I'll make this easy. You're creating a family tree that looks like a pretzel, a pretzel where someone ends up being their own grandpa, which is clearly not how that works. In your messed-up scenario, marrying a mother and then your father marrying the daughter creates a confusing mess where the relationships don't make sense.