You're telling me machine elves are just watching me all the time?

The oldest of my GF's kids told her mom when they were spending time alone together that that I act more like a father than her own father does. This is after spending 4 weeks here on summer vacation, with the only other in-person time together being at last year's winter break. For context, I'm a NEET who helps my older mom run errands and when with my GF and her kids, do chores and help out, clean, etc. I don't bring any income to the table.

Their actual father has a stay-at-home job and primary custody of the 3 kids, plus a kid with another woman (who also has a stay-at-home job) and she has 2 kids from two different men before him. They all live in a single-family home across the country.

What does /adv/ think about this situation? I don't know what I did to warrant having that said about me. I'm happy, yet I don't know if that's kudos to me, an indictment on their father or both.