Q: My left arm is stronger than my right arm (at least I can do more reps with my left) due to carrying my son around all day. Should I challenge the left arm by doing more reps or do the same amount for both arms?

A: It's more of a personal choice. If you don't mind the difference and just want to have maximum strength possible in both arms, then do more reps for the left, as you said. If you'd rather be more symmetrical and even out the two arms (which is what I would choose, probably along with most people), then do the same number of reps for both arms (so the left doesn't get as tired at the end of the set).