The shooting happened at the house of the woman, Pooja Yadav, in Jaitpur in south-east Delhi when she was playing with some kids, senior police officials said.
The attacker, Rocky Pradhan, was arrested from his native village Basantpur in Faridabad, Haryana, the officials said.
Yadav, a trained beautician, worked at a property dealership in Basantpur, which was run by Rocky's elder brother, Krishan, 37.
Rocky disapproved of Krishan's relationship with Yadav as it led to frequent quarrels, deputy commissioner of police (south-east) Rajesh Deo said, citing Rocky's interrogation.
"Rocky told us that his elder brother was already married with four children. Because of his relationship with Yadav, his sister-in-law and mother would often fight with Pradhan," Deo said.
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