Are independent subsidiaries still related to the parent company?

It's okay. Although the parent company and subsidiary company are actually holding relationships, they are actually two independent civil subjects in law.

Legal basis:

Article 26 of the Company Law of People's Republic of China (PRC), the registered capital of a limited liability company is the capital contribution subscribed by all shareholders registered in the company registration authority. Where laws, administrative regulations and decisions of the State Council have other provisions on the paid-in registered capital and the minimum registered capital of a limited liability company, those provisions shall prevail.