Need investing advice from my community

[Marco Cruzatt]

Hello everyone, 

A family member has some cash and wants me to invest.
Why me? I'm a civil engineer with a steady income, good credit and no debt.

My question to this forum is, how do I go about? 

Here is a scenario for a house flip.

Let's say I'm able to find a property for 300k, my uncle puts 20% down. I fix up the property and sell it for 380k

How are we supposed to split the earning? 
Any advice would be appreciated.

In addition, do you all think a flip would be better than let's say buy a 4 unit and hold.

Thanks in advance