"The first week is going to be pretty hard for both of us. Hopefully the place sells - the sooner the better."
His mother Anita, who saw her husband killed in June, spent a couple of hours in the store yesterday morning but had to go home.
"Getting up here was courageous enough," her son said.
Nearby shop owners were also quick to pay tribute to the strength of the Kumar family.
Great North Bakehouse's Sol Kang described them as "very brave", and Kylie Hoppenjans, from Cafe Cucina next door, shared the sentiment.
"I can't imagine what it's like for them," Ms Hoppenjans said.
"I think it's incredibly brave and strong that they've done that."
Shivneel Kumar said it had taken a lot of counselling and soul searching to get to the point where they could open the shop to the public again.
But well-meaning customers passing on sympathies had made it more difficult for Mrs Kumar, he said.
"Every single customer comes in and has their own story, and Mum has to go through it again."
He had been given leave from his job until November but hoped it would not take that long to find a buyer for the shop.
Ms Hoppenjans said there had been a greater police presence since June, and all the children who used to "hang around" outside the shops on Great North Rd had gone. "It's definitely been cleaned up," she said.
But the focus would be on their neighbours at the Railside Dairy for the next few weeks, she said.
A 13-year-old charged with Mr Kumar's murder will appear in the High Court at Auckland this week, with a 12-year-old charged with manslaughter. The pair have name suppression.
