Both might say they have the child's best interest at heart but disagree on how they get there or why.The fact that their is still animosity shows unfinished emotional business that needs to be closed out.

If so, perhaps you may want look at the overall project and the costs and timeline involved, especially what options are available for a construction loan ( the tear down and removal can be included if negotiated) and if the time and costs justify the end results, just to make sure that you don't over-improve and spend more than the market value of the improvement would make, if no emotional connection to the land, might be better to sell as-is and let another develop, lot of factors to consider, have a few contacts that you can ask, so you would be able to get a larger picture of time and costs.

Sellers change their mind and can get emotional if life changes happen.

We use the same standards for all applications.We try to turn every application into a non-emotional event. 

Like buying, leasing is mostly emotional and driven by the women (if it's a couple).

Or emotional rate?)

To do so effectively the emotions must be tamed. 

It's very easy to let someone else control your emotions, especially when they're essentially stealing from you, but it's not worth getting upset over, I promise.

It might be an Emotional Support Animal (ESA).

From my observations of what is available on the market, the asking prices are either over-inflated (speculate emotional attachment) or simply not worth the investment (ei. older property, too much reno) for it to be a viable income property post renovations.Talking to some local agents, the vacancy is also very low making it harder for property sales to happen.