God bless you all....your great aunt’s age is/was amazing! I hope your dad, and all of you, have a long and happy life together!
Her younger sister is still with us as well. Still just as spry and sharp as a tack.
His late great aunt lived alone, independently, until she was 96+. She took a bad fall on some ice, injured her back, and was put in a nursing home due to mobility issues. She declined quickly after that. I feel strongly that had one of her daughters taken care of mama she’d still be around. Most of the rest of that particular line lives/lived to 105 or 107.