Let an 8 year and a 6 year old hold your newborn with help??
I have 4dc so I feel my thinking might not be realistic and can't remember how I felt with first child but was definitely protective but I think sil and bil were a bit over the top not letting ds hold their baby.
They are very boisterous kids and I wasn't there so perhaps they felt dad wasn't so on top of things if anything. I don't know 