Hey @leaky20 :D
Yep, I am with you here. I also don't think it is an “either, or” scenario. And, it is quite surprising to still come upon well-informed people who stand by that kind of judgement. It's just too rigid!
Further, as you observed, there is still flexibility within this nature x nurture transaction. Not only do different environmenst prompt genes to be expressed differently, but there is also the possibility of modifying whatever results from that initial transaction. As in attachment styles, just like you observed! :) Thank goodness for neuroplasticity Leaky!

It seems that even birth order may have an effect on that as well as sex hormones can change and be influenced by previous pregnancies.

This brings epigenetic to mind. My knowledge of it is of minimum level, though! :D

Yep, for me, the moral of the story is that neither factor should be ruled out. For, as much as we are social animals, we’re also biological entities.

You guys take care as well over there with the doggies!
All the best to you two 😊