Does anyone know anyone that does 5% for a vacation home loan? 

A quick google search of your state indicates the following regaridng timeline to give notice:30 daysFor tenants who have lived in the property for less than one year, or have a lease for less than one year60 daysFor tenants who have lived in the property for more than one year but less than two years, or have a lease for more than one year but less than two years90 daysFor tenants who have lived in the property for more than two years, or have a lease for at least two yearsI'd definitely touch base with an eviction attorney in your state to ensure you are not missing any steps and to have the attorney as a backup option in case the tenant does not vacate easily.

This would likely take coordination with a tenant at some point - (ie - plenty of notice to them that they must vacate in order for you to sell the property)Since your current home is free and clear -  you could do a cash out refi or take out a new mortgage on the new house to be able to buy your paren't house and pay off the mortgage.  

Does anyone have experience investing in international vacation rentals?

There are some New programs coming for 2025 for primary homes, Vacation homes, and investment properties.

Its a vacation town. 

Forget the course and put that money on a quality vacation short-term rental.  

My goal is to live in the home during the winters, maybe 3-4 additional weeks for vacation, then rent it out to help cover the mortgage the rest of the year.  

Yes, you can put down 10% for a second home, HOWEVER the rate adjustments for a second home and investment property have been the same for several years now.

Majority of DSCR Lenders do not allow Manufactured homes but do allow for Modular.