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I don't really get what you mean. Maybe I'm one of those people who don't believe they owe a social debt to earlier generations? But I simply have no idea who I'm supposed to owe for what. Of course, if you have an elderly wealthy great aunt willing to put you through college, you should be thankful to her for the rest of her life and invite her to all family occasions and keep in touch with her. But outside of Hollywood movies, who has great aunts like that? It seems a bit far fetched.
Most of the families on my mother's side are that way. Older generations frequently save in order to give their children, grandchildren, and other family members a better start in life. Helping with child care and education is common. So is a heavily subsidized start in a family business or a household. If a person doesn't have grandchildren, they select some nieces and nephews to receive special support. It generally isn't an entire university education that gets paid for, but room and board while a young adult is attending classes is not out of the question.
In your specific situation, your father did not do what a responsible and socially conscious parent does. Rather, he did the reverse and took where he should have given. Your description of his conduct shows him as displaying a galloping level of parental entitlement that I wish only existed in Hollywood movies, but that happens sometimes when a parent's nether sphincter is fastened too tightly about his or her neck.
Maybe I take this personally because my fiance and I are planning to elope some time next year. We expect some negative reactions, but mainly from our direct relatives, we hadn't really thought about other people possibly being insulted too. In our case, we feel our relatives don't really give us any other choice but to elope. My parents have been divorced for a long time and my dad is a complicated, violent man with the impulse control of a toddler. For years, I paid his bills, washed his clothes, cooked for him, long after I had moved out and everyone else had given up on him. It was still never enough for him and all I got were complaints about how I never did anything for him. Despite my best efforts, he eventually lost his house, and he said he blamed me 100%. He got very violent with me and wanted to kill me - but he got some of his senses back and didn't actually kill me. That was the point I broke off all contact and I haven't been in touch with him since. My family doesn't agree with that, saying you can't blame him for his mental issues. My mother and siblings have announced they won't attend any wedding where he isn't present (my mother divorced him for the same reason, but she is of the opinion that the bond between parent and child cannot be broken, unlike the bond between spouses). On my fiance's side, his parents are divorced too and they'd love to come, but not if the other parent is attending. So our immediate family isn't giving us any other choice than elopement, in my mind.
Now, I know our immediate family is going to be insulted when we announce our recent marriage, but it's a direct result of their own actions. I hadn't for a second thought anyone else would be insulted. Your post got me thinking about that, but I still really can't see who we owe any kind of social debt to. Our grandparents were supportive as children, but only one of them is still alive. That grandmother is a very wise woman who recommended elopement in our circumstances. As long as we don't live in sin anymore, she's happy. We never received moral support, money or significant gifts from anyone. Maybe I'm blind to this, but I can't really think of any social debt we'd owe to anyone that needs repaying. I'm also not aware of anyone owing me any social debt either.
Based on your post, it sounds to me as though your father owes you a gigantic social debt. You don't see it or acknowledge it in part because so many other people cooperated with him to enable him to continue to treat you poorly. Indeed, after years of being abused to that extent it may be hard for you to notice smaller-scale imbalances. Or, you might feel as though one-way-street relationships between adults are somehow normal, appropriate, and sustainable. (They're not.)
With your father, as with most abusive people, everyone has to maintain a level of contact that's "safe" for themselves, that will not lead to further abuse. In many cases, limiting contact to occasional essentially public interaction or online interaction is safe, but in your specific case you've tried it and found that, since you're his favorite target, the maximum safe contact you can have with him happens to be zero. Other people in your family can get away with more contact chiefly because they aren't his preferred target. It appears to me that you're maintaining a safe distance. You're also not falling for the velociraptor play. Good.
There's a natural give and take in all human relationships-- a sort of ebb and flow, as it were-- but sometimes the flow is predominately one-way with one person doing the lion's share of the giving and the other doing most of the taking, for an extended period of time. That, in most societies, creates a social debt even if both parties are willing. If the social debt is not balanced, eventually the person doing the giving turns off the tap, so to speak, and lets the relationship die a natural death. The symptom of a person who doesn't balance out social debt is... not having any close, long-term friends.
It sounds as though you have a basically abusive, non-functional family that is banding together to help your father continue to abuse you. Under the circumstances, eloping and sending a heartfelt letter to each of the people you would have otherwise invited to announce your marriage (and, for some, explaining in writing that your decision to elope is a direct result of their specific manipulative behaviors), is highly appropriate.
The gap left by your abusive family must have been hard to fill. Were there truly no teachers, coaches, neighbors, mentors, bosses, or co-workers who made a difference in your life, with whom you're still in contact? It just seems unusual to me that there's not even one individual besides your grandmother who's hosted you for holiday meals, lent you money, helped you move, babysat you as a child, watched your kids if you have any, let you couch surf for more than a couple days, or set you up with a job lead. If everyone who did that is deceased, then it's possible you don't actually owe anything to anyone because you really did do it all by yourself. Otherwise, you may want to make a list of people who have helped you or given to you in a big way, and consider finding some way to acknowledge them. You don't have to invite them to a wedding, or even a reception, but is it possible to host or entertain them individually? If you were to reach out to them in some way I believe you would put yourself in a position to cultivate a healthy network of people that could become what some people call a "family of choice".