Needing HOA “foreclosure” advice.

I have a family member who lives in Houston that received a letter from an individual saying that they had acquired the deed to their property from the HOA and wants to work out a deal. This family member had mistakenly assumed that their mortgage payment included the HOA dues. 🤦🏼‍♂️. Anyway, they are about 4 -5 years behind although their mortgage payment is up to date. Has anyone experienced something like this or can suggest a lawyer