I have the LDS film 69152 for Grubenhagen indefinitely at my FHC, as well as
69222 for Ivenack. If you would like to send me a more specific name and
date (if possible), if the date range fits that film, I would look to see if
your ancestor is there before you ordered the film yourself. It probably
won't be until next week, though.
My Bitter family is on the Grubenhagen film, and maybe my Sadenwater family
on the Ivenack one.
Rea