Hi Jane82
The discovery of a parent with BPD traits can be a difficult process. Why the relief and anxiety? I relate to these mixed feelings, and it's not easy to get through. I'd like to hear where you're coming from on this.

Stop Walking on Eggshells is a great resource and has heaps of good ideas. Any thoughts on how it relates to your situation? I'll share that I had to hide my resources from my partner.
Relating to this person making an effort to speak to you, I've learned not to expect too much from a person like you describe. If I lead with my expectations, I've learned it has a higher tendency to disappoint me. From there I've taken the lead on the relationship and have been pleased with the results. I'll highlight it's not to
belittle (tempting) the other person's capabilities--but to
allow myself to accept an incapability. I think the difference is important.
I relate to sharing this sort of information with family members. Why would you like this to happen, and what will it do for the relationship between your father and you?

I hope you have some peace of mind during this time. I look forward to hearing your story develop.