Every 1k financed is usually under $5 per month which will not break the bank.Also, you can get the dn pmt as a gift from a qualified party.

My brother and I will be gifted 50% (25/25) of an RV park.

I don't know if this would be considered a "gift".

Here in MN I do $20 Caribou Coffee gift cards and you'd think I just gave them a months free rent, it really has a disproportionate impact.  

I made it a point to learn about 'gifts of cash' and 'gifts of equity' (GOE).

@Ben Clark the bank won't be okay with that, down payments can only be gifts not loans, otherwise the bank would just give you a 0% down loan.

The IRS may see that $900k difference between FMV and purchase price as a "gift."

@Jane DangThere may be tax implications.You want to speak with your accountant to see if there are gift-tax implications.You also want to check in to see who would be entitled to the real estate taxes as a deduction on an annual basis.

Specifically in real estate as a gift dealing with capital gain and such when selling.

The proper goal of charity is not to give (and virtue signal one's giving) but to see that the gift has some beneficial effect.