Guys, what do I do if two brothers appear to be "fighting" over me?

Anonymous
My neighbor has two sons and we have been good friends for the past four years. Recently I think something has shifted in my relationship with them though. The oldest one has been asking me to go do things with him a lot like catching a movie, grabbing ice cream, etc. and the other one always makes a snide comment about it such as "don't the two of you look cozy" while rolling his eyes.
The younger brother will just randomly pop up and start flirting with me, but when the older brother shows up they kind of glare at each other and he'll tell his younger brother to stop flirting with me. I don't want to cause problems between them and I'm honestly not interested in either of them as more than a friend. So what are they trying to prove and how do I handle this without complicating things?
Guys, what do I do if two brothers appear to be "fighting" over me?
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