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According to instructions for form 6252, it would appear that you aren't considered to be related.
See
https://www.irs.gov/uac/form-6252-installment-sale-income
Also see the rules referenced for related party under IRC Sections 453, 318, and 267
https://www.law.cornell.edu/uscode/text/26/267
https://www.law.cornell.edu/uscode/text/26/453
https://www.law.cornell.edu/uscode/text/26/318
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