Is AUTHOR wrong in the post ? POST : We're getting married in July and are finalizing the list of invitations, but we're deciding whether we should invite her extended family on her dad's side. There was a pretty serious fallout with that side of the family:

My fiancee's father (Dad) was one of 5 kids, and their mother passed away in 2014 with severe Alzheimer's and dementia. She owned a lake house that the whole family would use. One of Dad's siblings (Bro) wrote her will for her and had her sign off on it (presumably not really knowing what she was signing) stating that the lake house would be split 5 ways between each of the siblings, and in the event of the death of one of the siblings, their portion of the estate would be split among their children and not go to their spouse.

Dad was diagnosed with terminal cancer a few months before his mother passed away, so that seemed specifically targeted at my fiancee's immediate family. Owning a portion of the estate meant that you would be responsible for annual dues on upkeep/repairs/updates. Dad's portion would have been split three ways between my fiancee and her sisters, meaning they wouldn't have had enough voting power to try and stop expensive, unnecessary upgrades to the house so they would be on the hook for annual dues and renovation costs when none of them were in a good financial standing to pay for it.

Bro kept giving the reasons of my FMIL "not being part of the family" even though they'd been together for over 40 years, and that Dad's kids getting his part of the estate was "what Nana would have wanted". After months of my fiancee certain that she and her sisters would be stuck in this estate with no way out, Dad finally got Bro to agree to buy out his part of the estate. Dad was deep into his battle with cancer at this point and ended up passing away less than three weeks after they made the agreement.

Following Dad's death, Bro and the other siblings have all but cut out my fiancee's family short of receiving the occasional holiday card, and her mom is extremely uncomfortable about being near any of them after they told her she wasn't part of the family anymore. We're upset with the way Dad's siblings treated him too (since they sided with Bro and voted not to let my FMIL take over his portion of the estate or buy them out) so we don't really want them there either, but we don't want to look petty by not inviting them.

We think that not inviting Dad's siblings and their spouses but still inviting my fiancee's cousins would be a bad look, and the cousins might not come if the siblings try to convince them that my fiancee's family is the one that cut them all out. We could not invite any of that side of the family, which ends up being around 30-40 people, but we don't really want to cut out people who weren't the ones that did anything wrong (guilty by association isn't fair?) So WIBTA if we didn't invite any of that side/just invited the cousins?