Looking for a math expression to fit these series of inputs/graphs

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I require a math formula that lets me move smoothly between these graphs:

enter image description here

It must always intersect x=0 and x=1 as seen, and its peak must always be at 1. It can be a parametric equation. How might I generate something like this.

For example that middle graph might be equal to $y=-\left(2x-1\right)^{2}+1$

But that equation needs to somehow be modified to produce those other graphs.

Its almost like its interpolating between these 3 graphs:

https://www.desmos.com/calculator/2cofwiga9k

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A fit is given by $$y = \frac{x^{p}(1-x)^{1-p}}{p^p(1-p)^{1-p}}$$

with $$0<p<1$$

It can be checked at https://www.desmos.com/calculator/es1znohisl