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I don’t think anyone in his family actually blames Gelt, they want to free him from the academy and understand he’s being manipulated. His dad immediately went to talk to him and reason with him after he tried to kill Seig and decided he needed space from the rest of the family because he wasn’t getting through to him. I think maybe he thought his grandparents would have a better chance of talking to him and been able to give him the attention he needed. I don’t think they cut off contact on purpose. They seem to have been trying to contact him, Theo visited in person but Gelt was hidden and the academy refused any official visits.
All the more reason not put all the blame gelt, he literally was most likely the least informed about anything that happened at home because he left when he was 5! I doubt the magic academy let him visit often and form what I interpreted form the moms disease was it was a more recent discovery, I mean she had 3 other children and was fine, and form gelts pov the Mc was born and everyone stopped caring about him. I mean no one contacted him until the mom died, people deal with grief vary differently and blaming others is vary normal so is being mad he probably just directed it to the Mc because then there’s actually something physical he can directly the blame, instead of accepting she would’ve died anyway. he was obviously vary attached to his mother and the trauma from being ripped away from his family didn’t help, he probably doesn’t have any coping skills of emotional support, but the dad and uncle insisted of seeing he’s just a hurting child that still has the emotional control of a 5 year old, obviously he shouldn’t be attacking anyone but both are the dads children it’s just crazy how dad and everyone else can’t see how emotionally stunted he is like be a parent comfort your child and the immediate cutting all contact just makes me believe no one besides the mom really ever made an effort in having a relationship with him. Sorry for the rant,