In a petition to District Collector T N Hariharan, Tamil Selvi of Tuticorin claimed that her son Ramesh alias Balaguru was working as an engineer in Singapore and would attend yoga sessions there.
A few months ago, he returned from Singapore and straightaway went to the Isha Yoga Centre with his head tonsured and became a sanyasi, she alleged.
Her complaint comes close on the heels of a retired professor's allegation that his two daughters had been "brainwashed" by the centre and forced to become sanyasins.
Some women rights activists also accompanied her to the collectorate, officials said.
Retired professor Kamaraj and his wife had last week alleged that their two daughters were brain washed and forced to tonsure their head to become sanyasins.
He has also filed a petition in Chief Minister's Cell to rescue the daughters.