Carrie Underwood shared the sweet cards that her two sons — Isaiah Michael, 8, and Jacob Ryan, 4 — crafted for her 40th birthday on Instagram Friday Skip to content PEOPLE ...

Among them included the heartwarming cards that her sons, Isaiah, 8, and Jake 4, gave her.. These are the things the singer's 4-year-old son love about his mom. Instagram/Carrie Underwood ...