Business Travel and side trips

The rules on claiming travel expenses to a rental property (Schedule E) when stopping on the way for a personal reason are still fuzzy to me considering the wording about side trips.   I have a short term rental (Schedule E) that is 300 miles away.  My mother's home is enroute and I often visit her on the way to or from the rental for a few days.  She is about 100 miles from my home.  

 

Scenario 1:  If stay at my Mom's for 3 days and at the rental for 4 days. Do I claim the total round trip miles between my home and the rental (600 miles)?

 

Scenario 2:  I stay at my Mom's for 4 days on the way to my rental property and then continue on to my rental for 3 days. Then travel directly home from the rental property.   Do I only claim the mileage from my Mom's to the rental property and back home (400 Miles)?

 

Scenario 3:  I stop at my Mom's in both directions for 1 night and stay at the rental for 3 nights.  Do I claim the full 600 mile round trip from home to the rental property?

 

Scenario 4:  I stop at my Mom's in both directions for 2 nights each after staying at the rental for 3 nights.  Do I only claim the 200 miles round trip between my Mom's and the rental property?

 

Thanks in advance for your help.