Oh man, this one is painful...
We're supposed to laugh at how inept and silly and old Linda's mom is acting, but it isn't funny. Just because someone is old does not make them stupid, and Linda's mom is just stupid in this one.
And once again, Bob and the family are forced to run around like headless chickens to look after a family member that is acting selfish and awful.
This isn't funny. It's just infuriating.
Bob's Burgers is at its best when it's being sweet and heartfelt. And at its worst when it's pushing the idea that awful family should be constantly supported because they're blood relatives.
Just look at how the Belchers enable Gail's awful behaviour, never giving her the chance to grow and keeping her in a state of perpetual awfulness for eternity, and you'll see what I mean.
Also, Linda's mother yelling all the time is so annoying to listen to that my ears started to bleed after a while.