Her daughter, previously known as Kit-the-Kat because of her love of kittens, calls GG Mum. As does the man who should be called Kilometres (to be metrically, purrfectly correct). I wish I could do that. i.e. call her Mum. (Orphan, remember?) Nah, I miaow it wouldn’t be p.c. Yes, even cats have to be aware of such things and take them into consideration.
The closest I can get is mew. So perhaps GG is better. I mean, I can almost  get those sounds out, although I need a certain stimulus to do so… like a bird hopping around outside . to voicing GG outloud is to turn gutteral (Note: nothing to do with that place where your mind should not be!)