Lee Johnson admitted family ties meant nothing for 90 minutes as Oldham clinched a vital 1-0 win against his father Gary's Yeovil side.
Lee's Latics are now all but guaranteed survival in npower League 1, but defeat was a major blow to Yeovil's automatic promotion hopes. The Johnsons were only the second father and son duo in Football League history - and the first since the early 1970s - to come up against each other in management.
Lee Johnson, the league's youngest manager at 31, said: "This is a fantastic result for us and we deserved it. Any team managed by my old man is going to give you a tough game and I hope Yeovil go up through the play-offs."
Oldham striker Matt Smith settled a close-fought contest, heading home Lee Croft's corner in first-half injury time for his 10th goal of the season.
The Latics boss added: "We had a little cuddle at the end and I felt for him because he was upset with the result, but for us it's all about three big points. During the game I didn't think once about him being my dad, but we will probably spend some time together tomorrow unless I decide to play in our reserves game.
"There was a big build-up beforehand and a lot of attention on the two of us, but really I was more focused on getting the lads ready. The players didn't half work hard and I knew we would score from a set piece because we had a good 20 inches in hand on Yeovil if you add up all the players.
"We have a great chance of staying up now and one point will do it, but we won't be complacent."
Gary Johnson said: "Lee and I are staying in the same hotel and I'll just ignore him if he tries to talk about football. Standing on the touchline there were a couple of times when I wanted to tell him to calm down, but I'm pleased for Lee and his team.
"They deserved it more than we did, but I'm disappointed that our players seemed to be less motivated than Oldham. Generally we've done well this season, but now and again our little-boy-lost game comes out and costs us.
"We needed three points to stay alive for automatic promotion so now it looks like the play-offs, but the important thing is to get ourselves back on track as soon as possible."