I love the originality of the tree and how it has more members than the Finch Family does.
Here are a few ideas I will like to add if they are okay with you.
1. Maybe moved some of Marcy Sr. Kids to the generations below cos Rachel’s generation is 9 kids while Viney’s, Roy’s, and Marcy Jr.’s generations each have 3 kids plus it will help with the sorting of the dates cos it can get confusing at times like a example will be that you moved 3 of Marcy’s kids to the other generations, so Marcy has 6 kids while Rachel has 5 kids, and Viney has 4 kids now while Roy and Marcy Jr. still stay the same.
2. Maybe aged down several of the older uncles and aunts down to below teenager age to make the curse more real and tragic, and also so that none of the dead uncles or aunts make it long enough to see their nieces/nephews except the one inspired by Walter. Examples include Diana, Johann, Phillip, Hunter, and (either Hollard or Holton cos only 1 is inspired by Walter I think, but let me know if I wrong or not), and aged them down to all died below age 13, and before any nieces or nephews are born, and also aged down Rachel, so that way she is dead before her first grandchild is born.
Let me know if you want me to suggest new/alternative dates if you accept the moving down generations or the aged down suggestions I give you? Those will be the only suggestions since I like everything else especially Roy’s branch of the family which I think you did better with than Dawn’s branch of the family in the game itself.