How do you answer the question, "do you have kids?"

I have been with my partner for about 4 years. My partner and his ex live 4 hours apart from each other. Because of this, the kids are at our place 3 weekends each month, all school breaks, and every other week in the summer. The every other week schedule just started last summer (2024). I love these kids unconditionally and will do ANYTHING for them.

I started to say I have two bonus kids when people asked if I have kids. For some reason that still feels weird to me. For a while, I was worried the kids would think I was trying to replace their mom. I don't feel this anymore, but maybe that's why I feel weird saying I have kids?

A few months ago, one of the kids said I'm "basically a second mom." That filled my heart with so much joy. Because of this comment, I have been thinking more about how I should respond when people ask if I have kids.

Has anyone experience these type of feelings? I'm probably over thinking it like everything else in the world. :)