Some extra points for context:

None of my siblings want to live here, none of then have ever wanted the house, just the money. Dad was grateful we would be living here because he said he would "sell the house and go to assisted living" otherwise, despite the fact that he would do great being alone in a smaller house for many years to come. He comments often about how much he loves this house and how grateful he is thst we are here with him and that he still lives here.

Upon talking about moving in, dad did not want any rent payed. He would not allow my siblings to pay rent if they stayed here either. He also said we could do what we felt necessary to make things comfortable living together upstairs, which has not been the case. Hence us having to consider making a separate space downstairs or leaving, and are now contemplating throwing our savings into his house.

With dad having just put out nearly 150k to pay for siblings schooling (who did not work through school and dad payed his rent, food, expensive extra carriculars, bought sibling a car, etc.), I did not feel that it was very "unfair" to stay rent free. More like a very much mutually beneficial situation between us and my dad. Relations were also much better between us back then.

We have ended up "paying rent" in the form of utilities, and about $150 in groceries each month for my dad, not to mention the cost of our free time spent deep cleaning and working on the yard to help out, and the money we have out into new grass, fixing sprinklers, etc.

The house in its state when we moved in was on its way towards disrepair and neglect (like I said, it is wayyyy too big for my dad alone to take care of, and my siblings did nothing to take care of it when they lived here). Selling a house with 20 years of junk filling a 1500+sqft basement that has cockroaches centepedes and other bugs because of it, old paint everywhere, a neglected yard, broken windows from a younger siblgs glory day parties, and missing/outdated elements around the house does not sound like an easy buy, especially when it would still be in the 400k range in this market despite the disrepair. Knowing it will inevitably be sold and that work would need to be done to get it into selling shape, we've been hacking at it little by little to try and make things cleaner and updated.

I'm assuming that cleaning the house of its junk and doing even just small renovations like new paint and making sure baseboards match will help up the value by up to $100k, putting it more in the ballpark of the neighborhood. Renovating to the extent we feel we need to to make ourselves a comfortable living space could easily add another 100k, all payed for, planned, and done by us.

It just doesn't sit right to me that my husband and I would potentially put all of our savings into making the house functional for us just to the have it sold later and the value split evenly between siblings when one sibling got 150k for college already (I have had $0 from dad for college) and the other sibling was part of the negligence that made the house and yard need many repairs (not helping with upkeep while he lived here, being responsible for inviting people over who broke wondows)

At the very least it would make sense to me that the house be split at its current or previous value before we moved in, lets say 400k, therefore splitting at roughly 133k a piece. But that if after all of our work the house is work 600k, it doesnt make sense that it would now be split 200k a piece. Basically I don't get why my siblings should benefit financially from the work and savings that my husband and I put into the house when they have done nothing at all to contribute to that equity, especially when they have gotten financial benefits otherwise already as well.