They get married, have kids, need to move to a place with good school for the kids, downgrade because the kids have moved out.

I'm married with three children with two of those in college. 

1, A multi-member LLC is stronger,  Have your wife/husband co-own with your if you are married. 2, In your formation papers, articles of formation, State that the owner of the PA LLC is owned by the Wyoming one. 

My question is if my wife bought our house before we got married, and I am not on the mortgage would I be able to buy a duplex on a FHA or 203 loan.

Even if it was still deductible, chances are that your total itemized deductions, including HELOC, would be less than the new standard deduction: $12k for singles, $24k for marrieds.

I am also married with 3 kids, so I know the struggle.We bought our first house in Texas for 100k when we got married in 2010.

A Hail Marry option could be to go along with what the Seller's Attorney wants to get an opportunity to settle without litigation. 

I personally did this in my 20's and into my 30's until I got married and had kids.  

I know a homeowner who has owned his home since 1996 and currently renting it to a tenant, he is close with the family my brother married his daughter. 

I’m looking into using this as our primary residence as a newly weds (will get married in May) and will be our starter home.