My mom's parents as well as my dad's mother died in 1989 when I was 4. The closest grandparent I had growing up was my great-grandmother (maternal grandmother's mother).
I don't remember my dad's mother at all and was only around his father a few times. I recall a big birthday party for him at Red Lobster plus some years later visiting him in the hospital with my dad. He died in 2000.
As for my mom's mother, I remember visiting her and her boyfriend at their apartment and she made me some cookies. The only other memory of her is at her funeral. She was 1 month short of being 55 (she had her kids in her teens). I believe she passed due to liver failure (I know she was an alcoholic).
The only real memory of my mom's father was visting him in D.C. My maternal grandparents (both originally from South Carolina) weren't together and after he served in the army, he relocated to D.C. Years later he moved his parents in from the South. My mom always told me how mean-spirited and evil his mom was. My grandfather had remarried and his mother tried her best to sabotage their marriage. Neither one would stand up to her and eventually his wife dropped dead one day (only 40-41 yrs. old). By 1989, his parents were real sick and he took a leave from work to care for them. In December of that year, his mom died on a Tuesday followed by his step-dad on a Thursday. Two days after that and walking into the funeral home for their funeral, my grandfather suffered a fatal heart attack essentially in my mom's arms (he was 59).

This week was the first time my mom and I have been back to D.C. since '89. The main reason I wanted to go was to find his grave. The lady in the front office of the cemetery was a bytch especially since we told her we couldn't find his grave despite the location they gave. He's at a cemetery in Suitland, MD and their markers are terrible (they literally carved in row numbers in random head/footstones rather than using signs

). Anyways, the family counselor was relentless and found his grave (damn near a foot underground though). He promised to have it raised which is great news.
My great-grandmother raised my mom and her sisters (as her mom was out running around and her dad in D.C.). My mom later returned the favor and took her grandmother in as she started her own family. My great-grandmother was the sweetest person I knew growing up. She loved her garden and would give tomatoes to our neighbors. No one made better fried okra or apple pies than her and was also a master at sewing. She lived with us until 2000 when she suffered a serious stroke and eventually had to put her in a nursing home. She died the day after Christmas that year. I visited her grave for the first time in a while today. I still miss her.
