Supposed the seller is gonna close on her new house on 7/5 and vacant the property by 7/8 but due to lender was not ready, closing was pushed to 7/9.

If you wanted to, you could just close off the stairs access and call it a day.

Thirty years ago, it cost me $600 in labor and parts to replace a 50-gallon hot water tank, currently $1,500 and often they only last 6 to 8 years. 

All other fee's are collected in escrow and paid out when your transaction closes..

We purchased our primary property here in Hawaii in 2021 and have found immense benefit from the property setup which allows us to rent out our "ohana" unit (mother in law) which covers our mortgage costs.

The job in Hawaii terminates in December of 2024, so to meet the <60 day requirement for VA loans, I need to close around September-November.

A few things to consider: are you increasing rent each year to at least try to recoup some of the additional costs (everything goes up, so why should the family member not pay more-if it is your parents, it is more complicated), how much has the condo appreciated over the last 3 years since you bought it, and what would you do with the money when you sold?

I contacted an attorney prior to making the deal and he said it would be ok to get a shared well agreement after closing.

Focus on building a business model that outlines your value proposition, target market, revenue, cost structure, and key activities/timeline.

EDUCATE YOURSELF - yes, it will take time, but will lead to a selection that better meets your expectations & avoids potentially costly surprises!