Delinquent Tax on Free and Clear Property

[Michael M.]

Property in Los Angeles County is free and clear of a mortgage but delinquent on property tax this year. Property may be subject to probate as father passed away but children are slobs and house is falling apart due to deferred maintenance. Tax basis is 1960 and under prop 13, so I assume it's $800 a year behind.

It's my understanding the step mother widow has been willed the property, hates the kids living in the house and may sell the house after probate. When, if, or how should I get involved?