Dai Young felt his son Thomas' try in the second half was the crucial score as Wasps eventually recorded a convincing 42-10 win over Harlequins.
Quins had got the score back to 21-10 with 20 minutes to go but a fine score from Thomas Young, after some good interplay with Christian Wade, set them on course for the win.
Wasps scored six tries in all, three in each half, and now sit third in the Aviva Premiership table.
Director of Rugby Dai Young said: "You have to beat Quins off with a big stick, every time you play them, they are always a threat and they're always going to keep coming back at you.
"We lost a bit of that momentum in the first period of the second half but we give Quins a bit of credit for that, but I was pleased we held out and I thought that fourth try was really important for us.
"At times I thought we were scrappy, we had a lot of possession in the first 20 minutes and that last pass that stuck against Saracens, didn't quite stick and we bombed two or three opportunities, but between 20-30 minutes, I thought that was a pretty good period for us."
The loss leaves Quins sixth in the table, three points off the play-off places, but coach Conor O'Shea is optimistic that his team can bounce back quickly.
He said: "I have to say, I thought Wasps were outstanding, sometimes you lose some games and we're very proud people and don't like being on the end of big loss.
"We lost a lot of collisions and we won a fair few too but the ones we lost cost us a heck of a lot more and they have a lot of bullets to fire at you.
"They are in a rich vein of form, but we will dust ourselves down and there was no doubting the work ethic going in from our players there.
"We have to make sure we get ourselves right back into it next week, as there are probably six teams fighting for two spots behind the front two and it's going to go right to the wire as we all have to play each other, so we're not despondent by any stretch of the imagination and we'll be ready for the next game against Sale."