Brookes Brothers Puns

I have two step brothers, one named Brooks and one named Luke. I also have one Brooks Brothers shirt and every time I wear it around my stepdad he says "Oh, you've got Luke's shirt on."

Afraid I'm being accused of common thievery I always respond, "No, this is mine." And he gets this grin on his face and continues the joke and insists that I'm wearing Brooks' brother's shirt...

Ugh...