The Agarwals
Rukmani Devi (Dadi) had two sons. Vishvanath and Kailashnath.
Vishvanath Agarwal married Mrs. Agarwal and they had two sons - Om Agarwal and Gaurav Agarwal.
After Mrs. Agarwal had passed away Vishvanath Agarwal married Krishna Agarwal. Krishna had two sisters - Vandana and Vineetha.
Vandana never married but Vineetha and her husband had two children - Neeraj and Mitali, who after the passing of their parents, were adopted by Vishvanath and Krishna Agarwal.
Vishvanath and Krishna Agarwal had five children - Ajay, Chaaya, Sonali, Kamal and Preeti.
Om Agarwal married Parvati Agarwal whose only family was her Nani.
Gaurav Agarwal married Shilpa Agarwal.
Ajay Agarwal married Avantika Agarwal.
Chaaya Agarwal married Vikram.
Sonali Agarwal married Tushar.
Kamal Agarwal married Pallavi Bhandari Agarwal and after his divorce to Pallavi years later he remarried Trishna Kocher.
Preeti Agarwal married Vishal.
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Om and Parvati Agarwal had a daughter - Gayatri, who was exchanged at birth with another baby - Shruti. Parvati was preganant for a second time but she miscarried.
Gaurav and Shilpa Agarwal were going to have a baby who was killed before birth by Gaurav's old friend Doctor Shweta.
Gaurav Agarwal and Doctor Shweta had a daughter - Sunaina (Sonu) Agarwal whom Doctor Shweta gave to Shilpa to raise as her own.
Ajay and Avantika Agarwal had a daughter - Monalika Agarwal.
Chaaya had a daughter from before she was married - Chavi.
Chaaya and Vikram were to have a baby but she miscarried.
Sonali and Tushar had two sons - Viraj and Vigyat.
Kamal and Pallavi Agarwal never had children, however Kamal and his secretary Nivedita had one son - Krishna Agarwal. Nivedita died after giving birth.
Neeraj Agarwal was married and had one son - Parth Agarwal.
Preeti and Mitali Agarwal were never known to have had any children.
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The Gargs
Rukmani Devi's second son Kailashnath Garg was married and had four children - Devin, Rohan, Yash and Mansi Garg.
Devin Garg married Garima Garg and abandoned her and their children. He later married Anamika Garg.
Rohan Garg was to be wed to Mallika Vajpay but he let her down and married someone else, whom we do not know.
Yash Garg married the blind girl Khushi and they were last seen off to Singapore.
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Devin and Garima Garg had two children - Shashank (Sasha) and Machan Garg.
Devin and Anamika Garg had one daughter - Neha Garg.
Rohan and his wife had two children - Rob and Neelam (Neel) Garg.
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The Dhoshis
Sanjay Dhoshi was to be married to Parvati Agarwal before she met Om but because of his abusive nature, she left him.
Sanjay Dhoshi was married once before and had a son - Aryan Dhoshi. Sanjay Dhoshi was remarried to Mallika Vajpay and they had a daughter - Manya Dhoshi.
Mallika Dhoshi's sister Aslesha Vajpay was to be married to Neeraj Agarwal but the wedding was stopped by Parvati Agarwal.
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The Gills
Harsharan Gill had one son who is the politician Harpreet Gill.
Harpreet Gill married Anjana Gill and they had two dughters and one son - Shruti who was exchanged at birth with another baby - Gayatri, Gurbhani and Sanjong Gill.
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The Kauls
Bhushan Kaul married Neeraja Kaul and they had a son - Sameer Kaul.
Pallavi Agarwal and Bhushan Kaul were rakhi brother and sister until Bhushan discovered what Pallavi was really about.
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The Mehras
Mr. and Mrs. Wadhwa had a daughter - Rajeshwari Wadhwa who was married to Suyash Mehra.
Suyash and Rajeshwari Mehra had three sons - Shikhar, Nikhil and Ashuthosh Mehra.
Suyash Mehra was remarried to Parvati Agarwal on a contract basis.
Sanjay Dhoshi is Suyash Mehra's cousin.
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2nd Generation Mix
Shruti Agarwal (Gill) was proposed to Ketan Gupta but the marriage was called off. She was then married to Aryan Dhoshi. After that marriage ended, Shruti was hopeful of a relationship wtih Sambhav Khanna but he was killed in a bomb blast together with Avantika Agarwal. Shruti then married Sameer Kaul who was initially meant to marry Gayatri.
Krishna Agarwal was to be married to Smriti, until she died in a crash that also took the lives of Devin and Rohan Garg. He was then proposed to Manya Dhoshi but in the end married Gunn Agarwal.
Sunaina Agarwal was to be married to Rohith until she discovered he was involved in a scandal to ruin the Agarwal name, one put in motion by Sasha. Sunaina then fell for Yash, who turned out to be married to a girl named Priyanka.
Parth Agarwal is in jail.
Vigyat, Viraj and Chavi are unheard of presently.
Monalika Agarwal had a one night stand with Aryan Dhoshi and gave birth to his son - Sidharth Dhoshi.
Gayatri Gill (Agarwal) was meant to marry Sameer Kaul, but he fell in love with Shruti. Although there was a huge confusion set in course at the wedding by Anjana Gill to save the day by putting Shruti on the mandap in Gayatri's clothes, Gayatri continued making Sameer believe they were actually married. She slept with him and had his baby boy - Chotu, whom she gave to Shruti.
Shashank Garg was madly in love with Gunn Agarwal until she married Krishna and turned against him. Later Shashank fell in love with Monika, unfortunately for him, she took a bullet that was meant for Om Agarwal, another plan set by Sasha, and died.
Machan Garg is in jail for the murder of Manya Dhoshi.
Rob and Neelam Garg have been unheard of for a while.
Shikhar Mehra was to be married to Mayuri but he turned out to be evil and his plotting mind got him in jail for the attempted murder of Parvati Agarwal.
Nikhil and Ashutosh Mehra look to Parvati Agarwal as their mother even though she sent their father to jail.
Krishna and Gunn Agarwal have a daughter - Pragati.
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Suyash Mehra is in jail for the murder of Om Agarwal and attempted murder of Parvati Agarwal - two crimes that he did not commit.
Sanjay Dhoshi and Pallavi Bhandari continue their scheming to get even with the Agarwals.
Mallika Dhoshi and Aslesha Vajpay have been missing for a while.
Garima Garg has been missing and both Anamika and Neha Garg are in Bangalore.
Vishvanath Agarwal, Kailashnath Garg, Rohan and Devin Garg, Smriti, Om Agarwal, Ajay Agarwal, Avantika Agarwal, Sambhav Khanna and Monika are all dead while Harpreet Gill is in a coma - he shot himself at the discovery that he almost had Shruti killed when she was his real daughter.
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Hope that helps.