The incident happened last evening and the victims sustained injuries on their heads and had to receive stitches, police said.
They said the accused was drunk at the time of the incident and has been arrested, they added.
The victims' family stays in Khirki Extension area and were going home while the accused was going to his RK Puram residence.
They found themselves in a situation where three vehicles were lined up and not able to proceed as the first one did not move.
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Sanjay got into an argument with her and allegedly attacked her with a screwdriver, they added.
When her relative came to her aid, he was also attacked.
As the victims started bleeding it alarmed others present at the spot and a crowd gathered there overpowering Sanjay and rescuing the victims.
The police reached the spot and arrested Sanjay.
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