In GodricsHollow 1981
Lily Potter was putting her twins in the crib that when it happened.
The protection charm fell, that means the wards failed and wormtail betrayed them.
Lord voldemort pov
As I walked through the gate of the potters home, I heard James potter call for his Mudblood wife to grab the twins and run. So I blasted the door open and stunned James potter and walked past him, up the stairs as I came to the nursery to see lily Potter asking him to spare her children. But I stund her and walked up to the crib the baby boy was crying, but very strangely the little girl was looking at me curiosity. And I felt the power coming from the little girl so I aimed my wand at the girl and said ( Avada kadavra) but I noticed something is wrong the curse rebound to me but I managed to dodge. When I looked again is saw in sted of a dead girl there was White egg I looked confused but. I had to go so I took the egg and teleported to slytherin manner