Personalized Proud Firefighter Son In Law Youth T-Shirt. Thin Red LineYouth T-Shirt - Kelly Green with black and red American flag with fire fighter emblem says Proud Fire Fighter Son In Law. Show your pride in your courageous father in law or mother in law. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.