How can I apply for a UK visa online if my parents are no longer alive?

Sorry to hear about your dilemma. The following are the steps to apply for a UK visa online, I hope it will be helpful to you:

1. Register and create an account: Create one on the UK Visas and Immigration website (http://GOV.UK) Account requires filling in some personal information, including name, email address, password, etc.

2. Fill in the application form: In the account, you need to fill in the application form and provide your travel plans, financial status, family members and other information. Please note that the form needs to be filled out in English and true and accurate information needs to be provided.

3. Upload necessary documents: You need to upload some necessary documents, such as passport photos, travel certificates, financial certificates, etc. Please ensure that these documents are clear, complete and meet the requirements for your UK visa application.

4. Pay the visa fee: You need to pay the visa fee, which varies depending on the visa type and nationality. Please make sure the fee you pay is appropriate for your visa type and where you are applying.

5. Make an appointment for an interview: Before submitting your application, you need to make an appointment for an interview. The interview will be conducted by a UK visa officer who may ask you to provide further information or documents.

Please note that this is a general list of steps and specific application steps may vary based on individual circumstances. If you encounter any problems during the application process, it is recommended that you visit the UK Visas and Immigration website (http://GOV.UK) or contact a UK visa officer for assistance.

Also, make sure you have sufficient funds to support your stay in the UK and be prepared for any additional documentation you may be asked to provide.