Serious Eaters, I need you now!

We used to celebrate Thanksgiving with a lot of extended family, and now we've sized down and I do all the cooking. A family member who we are no longer in touch with used to make a KILLER lemon poppyseed rum cake and I'd love to reproduce it---it's a family favorite!

I tried a google search, but couldn't find anything that looked promising. From what I remember it was made in a bundt pan.

this year, I'm Thankful for the SE community!