Polite yet formal letter to family of deceased neighbor? Advice!

[Daniel R.]

What is a good, polite, yet “aggressive” approach to write to family that inherited a home from a deceased parent in the neighborhood?  Of note, the family is not local, so there is no prior connection.  How long would you recommend keeping the letter?  Major points to hit or not to hit in this statement?  Would this letter be best written from me, the proposed buyer, or a representative for me?  Thanks!