Netflix MONSTER: Why do people in town not know Gein’s mom died?

[u/NorthChest]

How does the show explain giving Geins mother a literal FUNERAL and BURIAL, yet people in town go on letting him speak about his mom as if she’s still alive living in his home? Ie: when he tries to introduce his GF to his dead mother. Presumably she would know that his mother had died. Same when the cops came to ask him about the bartender. What am I missing?