Help my Dad get custody of Mary

Please watch video above ^ ^ 
My dad... some of you may know him as "The Unknown Comic"
 I know him as the best father in the world. My dad retired 26 years ago when I was born to raise me. He is and always will be a dedicated and amazing father.
9 years after I was brought into the world, my little sister Mary was born.
She was diagnosed with Down Syndrome.
My dad and Mary instantly connected, their bond is so special. If you've ever been around the two of them, you'd know what I mean.
Mary is almost 17 years old now, and things have been great up until earlier this year...
Mary's mother has been trying to keep Mary from seeing our dad.
She is asking the court for him to have SUPERVISED visitation only. 
She's attacked my dad's character, his livelihood, and even has verbally gone after me.
My dad is heartbroken. (and so am I)
Mary doesn't understand what's going on, and she hates to leave my dad. :( 
It's devastating to see her cry everytime she has to go back to her mother.
My dad has had to spend an insane amount of money fighting since january and court dates keep being postponed.
As I mentioned earlier, my dad retired 26 years ago, so you can imagine money is tight, and lawyers are expensive.
But Mary is worth every penny.
I'm asking for your guys' help to pay these hefty, but necessary lawyer fees.
It would mean the world to us.
Please help put my family back together.