Ten of the bodies were blind-folded and gagged, and were found hanging from the ceiling of the house opposite Guru Govind Singh Hospital, police sources said.
Seven of the victims are women, including three teenagers, while four are men. One of the deceased women is 75-year-old, reports PTI.
The family reportedly ran a grocery shop and a plywood business out of their home.
Head Coach Sampaoli Not Decided on Argentina's Starting Lineup for France Game
France and Uruguay's respective progression into the quarter-final of the World Cup has ensured that both Lionel Messi and Cristiano Ronaldo will leave the tournament having failed to break their duck in the knockout stages.
"Prima facie, we suspect they committed suicide but we are also investigating the case with other possible angles of homicide as well".
Every morning, their shop would open by 6, but when it didn't till 7.30 today, a neighbour went to check on the family.
He found the bodies and informed police.
End of an era: Toys 'R' Us stores close for good
So, it would seem those discussions have progressed far enough for Toys "R" Us to some hope to fans through that initial post. We do live in a sad day and it was a crushing blow to the inner child in millions of people.
Indian TV channels broadcast interviews with neighbours who said the family did not have any discord among themselves.
The entire area surrounding 24, Sant Nagar, Burari has been cordoned off. No suicide note has been found, Mr Kumar said.
Who will win today’s Nigeria vs Argentina match?
There is no better opportunity than now for Argentina's players to step up and maybe create a legacy of their own. Argentina has to beat Nigeria in their 3rd and final group match at any cost.