Struggling between RF USM and STM lineup as an amateur

R2D2 wrote:

Keep in mind that the 85mm f/1.2 will be the equivalent (on FF) to the 50 you were using on crop. However, I think that 50mm is much more desirable than 85 for small kids (and you might want to go wider yet).

Many years ago I had Canon 50d and I've used to shot portraits of my family and colleagues a lot with @55mm on my Canon EF-S 17-55mm F2.8. So this would be roughly an equivalent to 85mm on FF.

But now it's more important for me to take pictures of my wife (or me) with the child in her/my arms. I've found my old 50d and tried some composition at home and I can acknowledge that 85mm on FF is too long for my needs. I.ex. a photo of a person on a sofa, or a photo of a person with the stroller, etc.

I'm pointing more in the direction of RF 24-105mm F4 as a universal lens and RF 50mm F1.2 for those special photos.

And what about photos of those small feets, nose, fingers, etc.? Can I do them with this RF 50mm F1.2 or do I need an additional macro lens, i.ex. RF 100mm F2.8? If yes, maybe I can just rent it for 2 weeks? Or with your experience, such a lens could be useful as well in the future?

Could someone give me some good tips for the lightning at home, without additional flashes? As I said, my wife wouldn't be content seeing me placing a lot of additional gear at home. But maybe a reflector near the window to bounce the light back would be helpful?

And this question I wanted to ask few times already, but I've forgotten each time: Is it possible to take a photo with R6 Mk II while recording a video? I.ex. while blowing candles? This would be useful for few years kids in our family.