They haven't listed gMIL's house with a realtor because someone has shown interest and they don't want to waste money on a realtor. (nevermind that they can write into the contract that they are already in negotiations with a specific person). So instead of paying a realtor they've paid for an inspection and an appraisal. Two things the BUYER pays for and they'll still have to pay for a lawyer.
DH just shakes his head. The dummy won't listen to us or anyone else.