I know what you're saying here, I truly do, but your idea of what is "fair" might not be what the decedent's definition of "fair" is. I'll give you an example--my MIL died recently. She had 2 sons, and the bulk of her estate will be split 50/50--fair, right? But, there are a couple of hitches. One is, she left 529s to 2 out of 7 of her grandkids (one on each side). Our niece got more than our DD, and we have 3 yet to finish college, while this is BIL's last child to graduate. Is it fair? Similarly, MIL left a life insurance policy to her 7 grandkids. But, BIL's 3 kids get half, and our 4 kids get half. Fair?
Just so you know, it doesn't matter to DH and I if we think it's fair--it was fair in MIL's eyes. I understand her reasoning. We chose to have 4 kids, not 2 or 3 or 12. And our children will go to college, whether they have a 529 from Grandma or not. We choose not to nickel-and-dime for an exactly even portion of the estate. I mentioned my jerkface brother up-thread--I'm 100% positive he would be screaming to high heaven if he thought he was getting short-changed.
My point is, it really doesn't matter what you think is fair, or how you would divide whatever inheritance there might be. It only matters what the decedent thought was appropriate.