Hate to tell you, but they probably just like YOU!! (I'm the same - 5 of us go away & I get savaged!!)
The time you didn't get bitten probably was due to the time of year you sent away & there wasn't too many about - I was away about 4 years ago, delighted at how few mozzies there were & then (as if it was their birthday) there were loads. None of the rest of my family seem to really get bitten & certainly don;t react like I do (lovely big red welts & yellow centres:mad
Heres what I did last year & I got away fairly lightly (only about 4 on the whole trip & not as bad). The list is an accumalation of different advice.
- Started taking a vitamin B tablet about 3 weeks before hols
- Use a regular mozzie repellent stick
- Use an after sun with mozzie repellent (Boots one is pretty good)
- Burnt citronella all over the apartment (will try the plug in thing this year)
- No perfume
- Bought portable mozzie things from Deal Extreme (not sure if they really did anything, but, hey, worth the few quid
Also for this year is Gin & Tonic (less the gin

, can;t stand it), apparently they hate the quinine in tonic which makes your blood bitter.
Also going to try to get citronella oil & dab it behind my ears....lovely!!
At least, I hope I'll get the chance to try these things out if I get a holiday!!