Seeking Advice on this 1031 situation

[Zachary Freeman]

I'm looking to purchase a multi unit property with my 2 cousins. They both recently sold a property for ~150k and they plan to use that for DP for our joint property.  I will be putting in a similar amount of cash.  Any advice for keeping this in lines with 1031 rules? 

We will be using conventional financing for a 4 unit property.  Can we all be on the loan? Is it required that they be on the loan? Or is their names being on the title sufficient? Any other things to look out for? 

Thanks

Zach