My parents have $2.1-2.5 million in savings(uninvested). $650k-$900k in antiques and other physical assets, and around $1.6-$2.4 million in real estate.

They are looking about moving country, selling all real estate and antiques and all assets and buying a house in the US (don’t need one more than $1m in value ish) and investing all of their savings.

What are good options for them to invest in?

How should we go about this process?

Thank you for any answers

EDIT: also for both my parents combined they have roughly a $62,000 a year pension for them to both live on separate from this