The little of love in a terrible life~

Liam,a twelve year old boy whose parents were murdered by some mysterious people. He had a tragic yet a lovely life. Tragedy was in every ounce of his life but he also had people's who adored him. Liam's aim is to find out who killed his parents nd take revenge. I hope you all will follow his journey from a mere commoner to someone you can't even imagine.

Questions:-
Who killed his parents?. Why would they kill them?. What are the things they are hiding?. Is there anything his sister is also hiding?....