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I didn’t think of it this way. My thought was that both child and adult was Liam. I was thinking he was experimented on and not quite human anymore. Forced to age quickly for whatever reason and Then given powers either by accident or through experimentation or something. I’m thinking he doesn’t age normally anymore and could potentially be Semi-immortal (in the sense that he can’t die of old age, but can still be killed by other means). I think Liam killed all those people for revenge. Anger from being experimented on, kidnapped, tortured or all of the above. But hey, it’s still fairly early! So much potential for plot twists!
PREDICTION:
(spoilers?)
liam was the younger child and the older child is someone else form the facility, possibly liams older brother? they were experimented on, and for some reason liam is covering for the older guy. as to why i have no idea. maybe guilt?