Nagle reports Yuzuquat as a cross between Nameiwa (reported as Nagami × Meiwa) and Yuzu. This is a source-reported pedigree, not independently genetically verified. Nagle does not specify cross direction or the individual parental accessions.
Source [1]: https://www.scribd.com/doc/138564018/New-Noteworthy-Citrus-From-Texas