My son and daughter and I practice jiu jitsu together.
My daughter enjoys it, I think, only because dad likes it and she wants to like things I like. She's a good kid. Very strong for her age and very muscular and really gets jiu jitsu, but she's a girly-girl and doesn't really have a passion for it.
My son enjoys it because he really likes it. His favorite move this week - the gogoplata. He's got these little bony shins and amazing flexibility that lets him land it. He thinks it's lots of fun watching dad turn red and tap out.
And of course they like lifting with dad too. But only just to compete with each other...not for any other reason. I'm fine with that. They don't need my mental issues that turned me on to lifting.