Granger Smith Says Son Lincoln, 7, 'Can't Get Enough' of 1-Week-Old Baby Brother Maverick
In the sweet pictures, the country music star, 41, cradles baby Maverick while Lincoln sits on his father's lap and smiles down at his brother. In a second photo, Lincoln adorably pokes the little boy's nose.
"Linc can't get enough of his baby brother! Mav doesn't know him yet…but he will," Granger writes on Instagram.
Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.
"There's a lot happening in the world right now. These kids were born for a time such as this. It's our job to equip them with enough integrity, resilience, strength, love and fear of God before they inherit the keys to this world," he continues. "I see no greater challenge, no greater responsibility, no greater honor and no greater reward. What an opportunity!"
Since welcoming their fourth child, Amber has addressed the "hurtful" comments she and Granger have received about their late son River.
In an Instagram Story last week, Amber shared several screenshots of criticism she had received, including an accusation that Amber and Granger were replacing River with their newborn baby.
"I never like to give these people more attention than they deserve, but it's a reminder that we live in a dark world, where people judge one another, and say the most hurtful, cruel things," Amber wrote.
RELATED VIDEO: Granger Smith Reveals Final Special Moment He Shared with Son River That Suddenly Turned to Tragedy
"Please think before you type or speak your opinions," Amber continued. "The Bible tells us that the tongue is a fire — James 3:6 The tongue is also a fire,(A) a world of evil among the parts of the body. It corrupts the whole body,(B) sets the whole course of one's life on fire, and itself set on fire by hell."
"Choose to be the light," she wrote in another post. "And know who you are in Jesus Christ so when flaming darts come are way you are wearing the armor of God. Not today Satan."