Can we take temporary steps while the legal issue over siblings or heirs fighting over an inherited house is unresolved?

Until the authority question is settled, protect the property, keep insurance current, pay only properly authorized expenses, and document every step. For the issue described here, during probate, the personal representative may control estate property and may need to preserve it for all beneficiaries. In a probate or estate setting, after title passes to multiple heirs, co owners generally have rights that can lead to a negotiated buyout or, in some situations, a court ordered partition or sale. Probate, trust, property, and family rules differ from state to state, so have counsel in the relevant state review the controlling documents and present court or title status before anyone takes a permanent step.