My grandmother used to work for the municipal government in a city in China. She held a top position in the government. She has been retired from that job for more than 15 years. This is a person I grew up with from the time I was born to 9 years old, I am 25 years old now. The last time I spoke to her was 3-4 years ago. She developed Alzheimer's disease around 9 years ago and our contact has decreased as a result, since she doesn't really remember who I am. She is also a Chinese national. Will her work in the Chinese government 15 years ago affect my top secret clearance?
It should not since you have no recent contact and she has retired from government service long ago, however, you will have to explain exactly what you have written here so that no flags are raised.