In some cases, it's definitely not in the blood. My daughter is an awesome bassist. If I try really hard, I could almost be described as someone who can wear a bass.
It's great watching your kids gigging. My daughter is always out gigging now. It's a very proud parent moment seeing a venue packed with people there to be entertained by your offspring and them having the best time absolutely smashing it.
Keep encouraging them and supporting them.
Here's XFR Jr playing at The Cheese And Grain in Frome with her band, Butane Skies. You can tell they're used to a smaller stage