Grandpa always has the answers—especially when he makes them up really fast! Featuring the witty phrase “GRANDPA KNOWS EVERYTHING. If He Doesn’t Know, He Makes Stuff Up Really Fast,” this shirt is the perfect mix of humor, sass, and truth.
Made with a soft cotton blend and a classic unisex fit, it’s comfortable enough for everyday wear and funny enough to spark a laugh at every family gathering. A great gift for Father’s Day, birthdays, or just to remind Grandpa that his quick wit is legendary.
Premium cotton blend for comfort and durability
Classic unisex fit for men and women
Bold, playful design perfect for funny grandpas
Great gift for grandpas who always have a story (true or not!)
| Size guide |
S |
M |
L |
XL |
2XL |
3XL |
| Length (inches) |
28 |
29 |
30 |
31 |
32 |
33 |
| Width (inches) |
18 |
20 |
22 |
24 |
26 |
28 |
| Chest (inches) |
34–37 |
38–41 |
42–45 |
46–49 |
50–53 |
54–57 |
