Hi Guest19-
Although it's a year later and you may not care, I believe I have an answer for you.
When emit carbon dioxide from our pores and when we breathe out. Bugs are very attracted to carbon dioxide. That is how they identify their food source. Have you ever been to an outdoor event and noticed that bugs (flies, bees) fly around some people but not others? This is because some people emit more carbon dioxide than others, and the amount we emit can change due to eating habits and the hygiene and health state of the body. Poor digestion and hormonal changes can effect how much CD we put out through our skin. Since the 2 of you are related, it's probable you have bodies that work similarly with regard to digestion and hormonal activity.
My guess is, since you work together and no one else in your family had the problem, perhaps you and your father ate similar meals while on lunch or experienced the same stresses at work, causing your bodies to emit more carbon dioxide. The body can take up to 2 weeks to expel the waste products from poor digestion and excess hormones. After the body cleans itself out from those things, carbon output would be less, making you less noticable to pests.
Other than that, the only other possibility I can think of is that you both had an allergic reaction to something you handles on that got on you. Even if it;s something you've handled before, your body's reaction can change for exactly the same reasons I mentioned above.
Take care:)
But I'm glad they're gone!