<human>: Can you provide a brief rundown of the text in within 3 sentences?

My Girlfriend and I(18M) have been dating for about a year and a couple of months now. But lately, I begun to realise that her dad is very restrictive towards her, and just her. For example, her Sister can go out with her friends(which does include guys) with a day's warning. Meanwhile, I have a fills up forms in triplicate. Not exactly, but I do have to ask a week to two in advance, and detail out the entire trip. Where we'll be going, how I'll be fetching her there, which shops, what time she'll be back. Now that's all fine and good, and I can ignore the favouritism. Most of the time.

One of the points that irked me the most was when he refused to allow his Daughter out on NYE, despite me asking A MONTH in advance, giving the following bullshit reason.
3 years ago, while in a NYE celebration at a shopping district, some soap bubbles got into her TWIN SISTER's eye. Her twin sister, not her. Three Fucking years ago. But that's the reason he gave when I confronted him in church about it. What he texted me, was that I had taken out his Daughter a few days ago (the 27th, our anniversary). Safe to say my blood boiled and an old powerbank suffered the consequences.

I'm pretty sure he has it in for my girlfriend, as any wrong in the house, would be my girlfriend's fault, and the twin Sister will always get off scot free.

The effects off this has been compounding and lately I've begun to feel the strain. I need advice on how to deal with this. Because I honestly believe that she is who I want to spend the rest of my life with, and I want to setup boundaries with him, so that he'll understand that his Daughter is old enough to make decisions herself, and to stop seeing her as the scourge of his family.
<bot>: Girlfriend's dad is restrictive of her, but lax of her Sister. Need help to get dad to loosen up.