The victims were identified as Hemant Chatwani, his wife Rajni alias Kanta (45) and daughter Diksha (21).
Police have lodged a case of abetting suicide against the Jaipur-based fiance of Diksha.
Chatwani, his wife and daughter consumed poison around 5 PM yesterday at their home in Aditaya Awas area, said Ram Kishan, sub inspector and in charge of Borkheda police station.
The three were rushed to Maharao Bhim Singh (MBS) hospital where they succumbed during treatment last night, he said.
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On a complaint by Hemant's father Surendra Chatwani, a case under section 306 of IPC was lodged against the fiance Kamal, a resident of Malviya Nagar area in Jaipur, the SI said, adding the investigation is on.
The bodies have been sent for post mortem.
Meanwhile, a 26-year-old married woman committed suicide yesterday morning by hanging herself in her room in Rangbadi area. Her husband, Narendra Singh Rajput, was away on work, the police said.
Further investigation is on, they said.