Rohit, who is in the navy, was detained by a team of Delhi Police in Mumbai at noon, said Dependra Pathak, Joint Commissioner of Police (South West) in Delhi
Rohit's father, Vijay Singh, also surrendered around noon at the Nangloi police station in the national capital and was questioned, said a senior police officer.
Vijay was a sub-inspector in Delhi Police and had been dismissed from service, he said.
A case was registered against Rohit and his parents and two Delhi Police teams had been formed to arrest Rohit and his parents.
Rohit's parents had left their home in Kanjhawla and gone into hiding after Lalita committed suicide.