Sage Stallone's mother has asked a judge to let her administer her son's estate ... which she values at $40,000.
Sasha Madron claims Sage died without a will, and left personal property valued at 40 grand.
Sasha wants full authority to make decisions on behalf of the Estate.
Sage died in July. The coroner says Sage died as a result of a heart attack, not drug use -- in fact, no drugs were found in his system at the time of his death.
See also
Sylvester Stallone on Sage's Death -- Horrible ... But 'Reality in Life'
Sage Stallone Death Certificate -- Still Waiting for Answers
Sylvester Stallone Calls In Famed P.I. Scott Ross to Investigate Sage's Death
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