If a sibling fails to contribute their share of the property taxes on an inherited property can they lose their interest in the property?

No. The only way they could lose their interest is by a court order. You would need to sue them for not paying their share. If the property was sold you could deduct from their share of the proceeds the amount they failed to pay for expenses. If it's a serious problem you should consult with an attorney who can review your situation and explain your options. You may consider buying them out.