Ethnic Chinese with foreign passports can enter China on a Q (family visit) or S (private affairs) visa, then apply for long-term residence at the local Exit-Entry Administration Bureau. Many provinces and cities offer special convenience policies.
If your parents live in China, you can enter on a Q1 visa and convert it to a residence permit, with multiple entries valid up to 5 years. Policies vary by province; Guangdong, Fujian, Shanghai and Beijing all have dedicated counters.
Friendly reminder: China does not recognize dual nationality — taking foreign citizenship automatically forfeits Chinese nationality. For long stays, complete your accommodation registration and get a residence permit before your time runs out.