Our front group (the ones that take care of daily life) has got 4 adults and 3 kids. Two of the kids are out a lot of the time and do a ton of non-work stuff. They play and have fun a lot.
I was reading last night about structural dissociation and they was saying that kid alters often contain the tendency for exploration and play (what other descriptors call a 'sense of agency'). And that is exactly what these front two do.
I think it is more normal than not!