It’s Tuesday afternoon, andDavid Nailis home alone with his 5-year-old daughter Lillian. Nail’s wife Catherine has just left on an out-of-town trip with Lillian’s twin brother, Lawson, and22-month-old daughterEllie, which means that the country music hitmaker will spend the next 60 hours trying his best to keep his darling daughter busy.

And yes, they have already gone on a Target run.

“I tried to get her to stay in the dollar bin this time,” laughs Nail, 43, during an interview with PEOPLE. “But she had her mind set on some squishy thing that was nine bucks.”

Of course, Nail made the purchase to make his daughter happy and put his own mind at ease, if only for a little while.

David Nail.Jim Wright

David Nail Opens Up About His Hope to Have Another Child with Wife Catherine: ‘We Would Love to Have a Summertime Baby’ hi! can I get photos 5 and 3 from this link: https://drive.google.com/drive/folders/1GB1EAPCfzO3tpN5RMDEvHwiZWI3H7MXb credit: Jim Wright

“She fell asleep right as we pulled into the neighborhood,” Nail says of the return from their shopping excursion. “But of course, when I tried to get her to lay down in the house, she fought me.” He laughs. “She was convinced that she wasn’t tired!”

It’s just another sweet and oh-so-relatable piece of the life of the Grammy-nominated singer/songwriter who has climbed the charts through the years with songs such as “Red Light” and “Nights on Fire,” but nowalsofinds himself living in a household with three children under the age of 6.

“I think both Lillian and Ellie are going to be just like Catherine,” Nails says of his wife of 13 years. “But my son Lawson, he’s very much like me. He’s very sensitive and he’s very shy. But he’s got a really good ear and he’s got a really pretty voice for an almost 6-year-old. He just doesn’t really know quite yet if it’s cool to sing, even though his father does.”

Indeed, with the release of his latest song “Sunset Carousel” and the recent announcement that he will be back on tour this fall with his “Story to Tell Tour” featuring special guestTyler Braden, Nail has found a way to combat his own self-proclaimed shyness while living within the country music spotlight.

And his kids have certainly helped him with that.

Granted, the couple did face their challenges when it came to starting a family, withboth being very open about their struggles to conceive.

David Nail Opens Up About His Hope to Have Another Child with Wife Catherine: ‘We Would Love to Have a Summertime Baby’ hi! can I get photos 5 and 3 from this link: https://drive.google.com/drive/folders/1GB1EAPCfzO3tpN5RMDEvHwiZWI3H7MXb credit: Jim Wright

Nail grows suddenly quiet.

And all the children are growing faster than ever.

“My son has developed a little crush on this girl across the street,” says Nail. “My wife and I joke around and say that he’s already got his first summer fling, and he’s 5½. It’s so cute, but he’s got itbad.”

It’s these sweet moments that now have the couple considering having a fourth child.

And this time, they hope it happens without a hitch.

“The twins weresodifficult to have,” Nail remembers. “We waited so long, and it was such an emotional thing that I think we both at first were just so grateful to even have two kids. You almost feel guilty wanting more.”

And if Lawson has any say as to what sex that fourth child should be, he would love to finally have a brother.

“Lawson is very adamant about it,” says Nail with a laugh. “He doesn’t even allow himself to think about it being another girl!”

source: people.com