The estate's executor manages the sale on behalf of all heirs, but a hold-out can still delay things, since major decisions typically need unanimous sign-off among the beneficiaries before a listing goes live.
One common resolution is a buy-out, where one heir purchases the others' shares at a price a lawyer documents rather than one the family negotiates informally; that legal work is part of what legal fees of $800 to $1,500 typically cover in a straightforward estate.
If heirs are genuinely deadlocked, an application to Court of King's Bench for partition and sale is the last resort. Get your hand-reviewed valuation from Joel Dyck.