No expenses are deductible on personal days.In this case - The IRS may come and tax you on the rent and disallow you any expenses.On a side note - Allowing a relative to live rent free may require the filing of a gift-tax return if above the annual exclusion.

They just sent me a happy 25th anniversary gift. 

Once him and his girlfriend moved in, they had got the lower unit a plant as a welcoming gift and in my opinion are just really great people.  

To make a long story short a relative has given me and my wife a large sum of money as a gift and we want to use this to purchase our first Condo/home.

She is going to put my name on the title and then gift it to me so I️ don’t have to pay for a down payment .

It sounds like the aunt gifted 1/2 of the property to her nephew, based on the above.

You can always use legal means to gift back that rent to them while at the same time establishing the property as investment without displacing them.

A single member or multi member LLC should provide equal protection.Have you looked into your mother gifting her portion of the real estate to you?

Be very careful when you are trying to structure things purely for tax avoidance.If you add your son to the title, you made a taxable gift to him. 

I asked earlier if folks offer gifts to their tenants at the holidays or move in and I got mixed responses?