A local entrepreneur says that he handed his three thirtysomething sons successful companies, more than $7 million in loans and a $900,000 line of credit only to watch them side with his ex-wife in a divorce, try to extort him and run their gifted businesses into the ground.

“Kevin Semcken is concerned about his sons and about the companies which he founded for them,” attorneys for that businessman wrote in an Oct. 24 lawsuit. “Although he has no desire to harm his sons, he must protect his financial situation, his credit and his business.”

Semcken, 66, made his money investing in medical technology, first through HealthTek Ventures out of Evergreen and then Able Planet , a hearing aid company. Before they divorced, he and his wife Mary owned the Villa Tramonta Rosa , or Mansion with the

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