This can actually be a vow, a promise, or simply a belief. Many spiritual people believe that they have to deal with their ancestors’ karma and similar things. This makes them feel spiritual and (or) superior.
Yes, there can be certain ancestral issues to work through, but that does not mean spending your whole life — or years of it — struggling and constantly wondering which grandfather created the mess you are dealing with now.
If you hold the belief that you must continuously resolve ancestral problems, then new problems may keep appearing to be solved, simply because on some level you have agreed to that pattern.
If it is a vow, it may even have been made in a past life and still be playing out now. But if the awareness of it is reaching your conscious mind through the external world — in this case, through me writing this to you — then perhaps you are now allowed to become aware of it and make a conscious decision: whether you still want to continue fulfilling that vow, or whether the time has come to release and dissolve it.
Most of the times, the system does not oblige you to do this. You need to understand whether your ancestors have actually asked for something to be resolved, or whether there really was something in the past that needed attention, but after resolving it, you simply continued doing the same thing out of habit, momentum, and belief.