I think the number of people still complicates things.

What happens if one of the 4 people pays in for three years the leaves? Do they get equity? How much? What about repairs? What if the roof needs replacing or the hot water tank or AC goes? Who pays when someone punches a hole in the wall? Should the two people that "pay in" get more equity? They are the ones taking the risk.

Given home prices are at an all time high, what happens if the property takes a loss after 4 years? What if someone doesn't want to sell at the end of 4 years?

As everyone else has said, this is not a great idea.