Maybe Poof's mom has (relatively) recently gone through some hardships with the aging / ailing health of poof's grandparents and doesn't wish that stuff on her.
When my dad was going through the hardships of his parents not being able to take care of themselves anymore, and then on their deathbeds, my dad's attitude to me was basically, "I don't want to be a burden to you guys, if I can't take care of myself I'm just putting a bullet in my head."