Michael Madsen's Children Fighting His Ex-Wife Over Millions

Michael Madsen's kids are battling his ex-wife, Jeannine Bisignano Madsen, for control over his estate ... asking the court not to put her in charge of the estate for any reason.

Four of Madsen's children -- Max, Christian, Calvin and Luke Madsen -- filed documents earlier this week opposing Jeannine's appointment as a special administrator ... a role she says she wants in order to collect on $5 million Michael allegedly owed her.

Basically, Jeannine is citing her divorce judgment ... which she says states she's entitled to a percentage of payments Michael received for films he made while they were together -- including the cult classic "Reservoir Dogs."

She says Michael never coughed up the dough ... and, now she wants $5 million.

Michael's four kids -- two of whom, Max and Christian, he shares with Jeannine -- are asking the judge not to appoint her special administrator, even in this limited capacity.

As you know ... Michael passed away in July of last year from cardiac arrest. The cardiac arrest was brought on by cardiomyopathy, coronary artery disease, and chronic alcoholism.

We shared a video of Michael's four children gathered together and hugging shortly after their dad passed away.

Michael was 67.