Your grandmother lived her an entire life as a rich, debutant cat. You can't exactly remember the name of the family that she was the cat for, but you kind of remember it being something like Betty Crocker... Whatever it was, it's unimportant now.
Cat's have nine lives. Did you know that? Oh, you did, but you thought it was a myth? Well cats, and specifically Indigoans, have nine lives. These lives are all very long. Around 20 years per life. So, by the end of the last life, the cat had been doing things for about 180 years. That is a long time, not only for a lifetime, but also for anything in general. If you look back 180 years ago (from when I am writing this and not comic time), you get the 1840's. Slavery was still wildly a thing back then, the united states had half as many states, Hong Kong was still Chinese, new Zealand wasn't a thing, and a lot more things. Grandpas got a lot of strange things to say in his 80's, imagine if he were twice as old and then some.
Indigoan society didn't really have a start as more as it came into being, and a bunch of cats began to start talking. Your grandmother was in her second life when this shift came into being. She instantly upended the decent family that she was with at the time for new beginnings in Indigo Town. It was a town before it was a city, you have to at least know that. And she set up shop as the town's stylist/barber. Of course, since cats love to lick themself and their hair naturally sheds (for the most part), cats usually have these large clumps of hair all knotted up and stuff. She, your grandmother, was the one to get these knots out of the hair and into the trash where they belonged. Unfortunatly, she wasn't an apt businesswoman, so by her third life, she was bought out by her rival, who now sells that service as well as fur cure product.
In the lives leading after her ousting, she had many short-term successful companies, but after a few years, none of them survived. By her fifth life, she began to attempt to get money from her previous owner in her first life, but none of the members remained, and their children and grandchildren didn't care too much for her. While she was in the ass-kissin' business, she went to a few balls, a few charity events, and other rich human things. She met a very interesting man who wore a bollo tie and star-shaped glasses who told her about destiny and how they were destined to have a child. They ended up with your dad.
Your grandmother thought that the man she had met would financially support her and her new child, but he ran off to father many other children of his own, leaving them behind. But he did leave a medium-sized fortune for his son, along with a copy of his memoir, and instructions to never open the safe until his son had reached the end of his second life. This almost happened, but when your grandmother left, she took all the money and left your dad essentially orphaned.
Your dad grew up hearing all these cool stories about his father, much like you with your own momma, and idolizing him. He later immortalized this admiration by falling in love with 70's and 80's rock music. Of course, along with the GnG stuff, your grandmother banned him from listening and playing that stuff. This ultimately led your dad to sneaking them into his life wherever he could, which he continues today, only maybe not as much.