Thaai Magalukku Kattiya Thaali () is a 1959 Indian Tamil-language film produced, directed and photographed by R. R. Chandiran. The film stars M. G. Ramachandran, N. Jamuna and P. Kannamba. It was released on 31 December 1959 and became a box-office bomb.
Plot
Sundharam Mudhaliyar is a wealthy man living with his daughter Kaveri. Sahadevan lives with his wife Thanabakkiam and daughter Sundhari. During a dance competition at the school function, Sundhari wins the first prize and Sundharam could not accept this as Sahadevan's family belongs to an inferior caste and indebted money from him. Sundharam magnifies this simple misunderstandings which results the death of Sahadevan. To cover this up, Sundharam disposes the body into the river and cooks up a story that Sahadevan had run away to avoid paying his debts. Sahadevan survives but suffers from amnesia. Sundharam seizes Sahadevan's house and land as a compensation for his debts and Thanabakkiam and Sundhari had to leave to a smaller house in another village. There Thanabakkiam saves the life of Kanagasundharam alias Kanagu from drowning in the river and thanked by Kanagu's father Loganayagam of the assistance rendered despite the difference in their caste. Kanagu and Sundhari becomes close friends and grow up to be lovers.
Loganayagam who would like to renovate the school requests Kanadu to seek donation from Sundharam. Kanagu and his friend Dhuraiappan leaves to Sundharam's place when they bump into an arrogant and modern girl Kaveri. When Kanagu goes back she is shocked to learn that Kanagu is her relative and falls for him. Meanwhile, the villagers and relatives of Kanagu tries to drive Kannamba and Sundhari in order to separate Kanagu and Sundhari from getting married but they fail to do so when Kanagu intervenes. Thanabakkiam discovers Kanagu and Sundhari's relationship and tries to advise Kanagu but Kanagu promises to marry Sundhari. The villagers and relatives of Kanagu complain to Loganayagam about this but Loganayagam agrees to get them married. Matters gets worse when this news spreads to the whole village which paints Kanagu as a womaniser. Fortunately Loganayagam does not believe this and sends for Thanabakkiam to arrange their children's wedding.
Things become serious when Sundharam wishes to get Kaveri married to Kanagu and warns Loganayagam that should that not happen, Loganayagam needs to settle Rs 2 lakhs that he is indebted to Sundaram. Upon knowing this, Kanagu and Sundhari registers their wedding without anyone's knowledge, only to be witnessed by Dhuraiappan. The villagers come to a conclusion to disown Logunayagam's family and no workers would work for them. Kanagu ploughs the soil and works in the fields himself. Logu unable to bear all this requests Thanabakkiam to accept compensation and to leave that village. Thanabakkiam gets even furious when she learns that Sundhari is pregnant and Sundhari ties to commit suicide by jumping into the well but saved by Thanabakkiam. When Loganayagam learns about the wedding registration, he apologises to Kanagu and requests Kanagu to inform this to Thanabakkiam but Thanabakkiam's house is engulfed by fire. All thought that Thanabakkiam and Sundhari had perished in the fire but actually both had left the village.
In another town, a rich landlord Arumainayagam is looking for his long lost younger brother in order to surrender all his wealth. Sundharam learns that Loganayagam is the person but hatches a plan to get Kaveri to be married to Kanagu in order to swindle all the wealth. Sundharam threatens by using Loganayagam's signature to prepare a letter saying that Thanabakkiam's house was burnt by his order. Knowing this, Kanagu pretends to agree marrying Kaveri but Loganayagam who is not in favour of this becomes sick and dies on the wedding day. Thanabakkiam ties a thali to Sundhari and advises that thali is important to a married lady even though wedding registration took place.
Kaveri soon learns of Sundharam's deeds. Kanagu donates all his land to the villagers and turns his house to a school and the villagers apologises on the guilt of defaming Kanagu before. Kaveri too donates her jewellery to the needy. Sundharam opposes to this but Kanagu settles Loganayagam's debt to Sundharam. Kanagu requests the villagers to be in the registration office tomorrow to transfer his land to their names and to stop this Sundharam accuses of Kanagu is mentally unstable and admits Kanagu to a mental sanatorium without anyone's knowledge.