Am I the asshole??

9

AITA for "forcing" my father to pay child support

My father is a dick. When he got my mother pregnant he wanted her to quit her job and just stay home to "be a good little wife and mother.  He is very well off due to a trust fund and he doesn't really need to work.  My mother refused and divorced him. Because of a prenup she got very little and he moved back to Europe. His parents never knew about me and my mother had a good profession and I never really wanted for anything. My grandmother and grandfather, her mom and dad were awesome, and I got to spend my summers exploring the wilds of Western Canada with them. My father never paid the child support he should have. Like I said it did really matter. My mom makes good money and she gave me a great life as a child. 

So the point of this post.    I'm (F28) getting married.  I met the love of my life (M31) at university and we have been together for eight years.  He is a wonderful person and he really is my lobster. (Sorry, Friends reference).
His family is from the same city as my father and they are a huge rambunctious bunch. Because of a lot of intermingled business and personal relationships my parental grandparents found out about my impending wedding and me I suppose. The have been in contact and want to come to Canada to meet me and my fiancee who I guess is a grandson of an acquaintance of theirs.  Small world.

When they found out that my father had basically abandoned me to fend for myself in this world, this is honestly how they see it, they were pissed to say the least. It is very funny because we are decidedly upper middle class here.

So long story short they had their lawyer calculate the amount of child support my father should have paid with inyerest and the cost of my post secondary education. They then gave my this as a gift.  What I didn't know was that it came out of my father's yearly draw on his trust fund. 

He is furious because it is obviously a sizeable amount and it will very much affect his finances for at least the next two years.  He may need to ,GASP, get a job. 

He has been contacting me and telling me that his current wife and children will be negatively affected if I don't give him back this money. 

I don't really need it. And I guess I am entitled to it and I am getting a trust fund now as well. 

But I really want to pay off any debt my mother may have and make sure that when she retires she can do whatever suits her fancy.

I'm not giving it back.

AITA?

Edit: to answer some common questions.

1. My half siblings will not really be affected. They have trust funds set up already and their tuitions and fees and stuff are covered.

2. My grandparents family sets these up when ba kid is born.  One of the reasons my father is upset is because since he didn't bother to tell his parents about me they did not set this up.  They have since taken a good chunk of his trust fund and used it to set mine up. Realistically the principle being separated 28 years ago would have left him in the exact same position.

3. My mom was working on getting her PhD so she could help kids with a certain condition.  That is what he wanted her to walk away from.

4. My grandparents have sent me pictures of my family there. The coolest thing is that my grandfather looks like the granddad from The Parent Trap.

5. My mom never remarried. But she has had a special friend since I was five.  He is amazing and taught me to swear in Colombian Spanish.

Edit número dos.

I just had lunch with my mom. Apparently she has no debt. Like at all.  I guess she did literally write the book about the treatment for the kids she works with she does okay for herself.  I never really thought about it.  We decided that what would be best is to set up a scholarship for people who want to go into her field of study.  Since I am now a trustafarian I can afford to do this. I am however going to book her and her "friend" a trip for after my wedding. And I am going to go pay off my car.
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                              EDIT
My half brother has posted about this. He has a slightly different viewpoint than myself.  He is not in any way coming after myself or my mother. If you comment there keep in mind he is a young man who is disillusioned with his father.