1.) Bell, Alfia, and Zard are part of Erebus Familia
2.) Meteria and Bell stay in Orario
3.) Alfia and Bell meet in Orario after Meteria's death while he is aimlessly wandering the streets mourning her death
4.) Alfia is initially annoyed by Bell until she realizes who he is
5.) Alfia, Erebus, and Zard follow their initial plan until Alfia brings Bell back, at which time they decide to sell out Evilus to raise Bell instead
6.) Bell is afraid of the dark and Erebus helps him out of the fear.
7.) Bell's future abilities should remain mostly the same with the exception of Firebolt, as the influence of his 'mother' Alfia changes his views on magic to something similar to Gospel, and if you cop out and just give him Gospel I will hunt you down.
Please DM if you have any further questions.