Midfielder Enzo, 22, plays for small Primera Liga club after leaving Madrid's reserve team in close season.
Zidane faces son Enzo when struggling Real Madrid visit Alaves
Real Madrid manager Zinedine Zidane will go up against his son Enzo Fernandez for the first time when he takes his struggling Spanish champions to Alaves on Saturday.
Midfielder Enzo, 22, left Madrid's reserve team in the close season in search of first-team football at Alaves, where he has made two Primera Liga appearances so far.
But with his side already seven points behind early league leaders Barcelona and in desperate need of points, Zinedine will put his job over family ties.
"I hope he [Enzo] doesn't score, we've got to look after our interests," the 1998 World Cup winner said. "I don't know if it'll be strange to be up against him but I'm happy for him because he's doing a good job.
"I haven't thought about it much. I'll have my own feelings but the match is Alaves against Real Madrid, that's the most important thing for me."
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Zidane's 19-year-old son Luca could also make the trip as Madrid's third-choice goalkeeper, and like Enzo, he has played for the French Under 19 team, while his younger brothers Theo (15) and Elyaz (11) also play in Real youth sides.
Former Ballon d'Or winner Zidane said that he has not had a hands-on approach with Enzo's career since he left the Santiago Bernabeu, after giving him his Madrid debut in a Copa Del Rey match last year, in which he scored.
"Enzo is very competitive, as am I. I'm watching his development as a player but I speak to him as a dad," he added. "I'm not his coach, I'm his dad and I don't have to give him anything in terms of football. When we speak, it's nothing more than a father-son relationship."
Although his dad might not be willing him on, Alaves could do with a goal from Enzo on Saturday, as they sit second-bottom in the early table, without a point or a single goal in five matches.