Hello there, ccc1.
Thanks for pointing that out. Allow me to share some information about recording Long Term Liabilities to a Family Member in QuickBooks Online.
You can issue a multi-purpose loan to your customer. Let's first create an account to track the loan and its payment.
Once done you can issue a check for the loan. I'd be glad to show you how below:
Now you're ready to record customer payments. To do this, you can create a recurring invoice for your customer for monthly payments.
To know more about tracking customer loans, here's an article that you can refer to: Track customer loans.
Fill me in if you have follow-up questions about this. I'd be happy to clear things up for you.