I'm in my early 30s, married, with one child and another on the way.

Renter will likely have a child.

And it's because they're only getting 20% of the story from their child.  

The contract says no one else besides them can be there for over a week so it is my choice,  what options should I consider for this, a rent increase per child, security deposit increased. 

Essentially you create a parent LLC with each property in it's own secondary or child LLC.

I mean Joe Montana is a very successful Developer same with Steve Young.. and Ronnie Lott has done well in RE also.but I bought a big mansion that was 3/4 done from an NBA star and he was not business savvy at all.. and on top of that had about 7 or 8 baby moma's all with child support judgements against him ..

I agree 100% the passing of a child is sure to draw the ire of the AG and the Feds. 

If he were an adult, perpetrating a crime on a child under 12, I wouldn't touch it with a 10-foot pole.

We just had our second child and are outgrowing the house so we want to purchase a bigger house while keeping our current house as a rental property.

Would like to 1031 the cabin and assume loan on house but my monthly income is child support $1137 for 1.5 yrs and a lame income of $800/month.