No. Zootopia had no family competition until The Jungle Book which was mid April on it’s seventh week which had a 40%+ drop. Also there was no family films at all since Kung Fu Panda which did ~140m iirc.
Onward faces Mulan on its fourth week, Peter Rabbit 2 on its fifth and Trolls 2 on its seventh. A benefit is Easter weekend is on the sixth to offset a drop. That said, family films take theater space which is something we all know, take Boss Baby which fell nearly 50% on its second weekend due to Smurfs which did sub 15m OW, Lego Batman’s late legs collasped due to the one-two-Three punch of Beast, Boss Baby and Smurfs back to back. It is also is after Sonic, which at the very minimum I’m expecting 150M, more likely 180-200M
Granted it won’t effect Onward’s second weekend or third weekend which if as long as it keeps the Pixar quality, I wouldn’t expect drops under 35% for those two weekends but I do think the films after it will hamper late legs a bit due to space. That said I don’t see under a 3.5x multiple for Onward, especially since I’m guessing both Mulan and Trolls want 4,000+ theaters and Rabbit 2 likely at 3,500 theaters