The Walesa family held a private funeral for Przemyslaw Walesa, the third-born of his eight children, in their home city of Gdansk.
There was no television coverage of the funeral, but the Super Express tabloid reported on its website that the body was cremated and taken in an urn to a local cemetery for interment.
The younger Walesa was discovered dead in his Gdansk home on Sunday by a family member. Investigators ruled out foul play or suicide, but gave no exact cause of death.
He left behind two teenage sons of his own.
Lech Walesa has remained silent about his grief in past days but today issued a brief statement on Facebook saying, "Thank you to all you have shared their sorrow with us in this very difficult time for us."
Walesa, 73, won the Nobel Peace Prize in 1983 for his role in leading the nationwide Solidarity freedom movement. He was Poland's first popularly elected president, serving one term, from 1990-95, before being defeated by a former communist.
He has struggled with allegations that he served as an informer for the communist-era secret police in the 1970s, something he fiercely denies.
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