Let me apologise first for only just getting round to reading this *sorry*
I loved it! First off I wasn't sure what Severus' intentions were towards Harry and the children, but when he didn't strike out at them I knew I was going to love this story. 'Monster and Spawn' are just brilliant nick-names and actually suit both James and Al to a T. The relationship between Harry & Severus was just right, tender, argumentative but above all loving.
I had no sympathy for Ginny whatsoever and yes although it was slightly shitty that Harry just disappeared with the children, she certainly deserved it IMO.
I just loved everything about this, from the 'kidnapping' to the early years of them all living together, to Jamie going off to Hogwarts and worry about his 'parents', Al having his birthday with everyone present, it was just a brilliant read and definitely going in my memories file.