If the estate has to go through probate before a decision can be made, the Court of King's Bench issues the grant that gives an executor or administrator authority to act, and no single heir can unilaterally sell or lease the property before that happens.
A buyout is often the cleanest path when one heir wants to keep the house and the others want cash. That heir typically needs new financing to pay out the others' shares, and a lender will size that mortgage the same way it would for any purchase, checking gross and total debt ratios and requiring a minimum credit score of 600 under CMHC's insured lending rules.
Keeping the house as a shared rental works only if everyone agrees on a manager and a split, and disagreements about maintenance costs or tenant selection tend to surface fast once the estate is actually settled. Get your hand-reviewed valuation from Joel Dyck.