Actually I think that it really helps not to have heaps of prezzies to open straight away, they end up with so much they don't know what to do first, and then just end up bugging you
My kids will open up things in Xmas morning from SAnta and DP and I.
Mum will bring up one pressie in the afternoon,
We will go to DP's family in the evening, another couple of prezzies.
Boxing Day, sister and her DH and my nephew will be there, pressies from them, and Oh look, Santa left a stocking there too !!!
On boxing day they go to their dad's and I have no idea what happens there, but santa is sure to have left something there,
I actually really worry about them being spoilt vbut at 4 & 7 I spend a nominal anmount, one present off the the list, and little things.
I think that they really love that the presents just keep coming, a few every day over a couple of days rather that a massive fest.
I have rmabled but i hope I helped