Dear Bin Bin
If it helps to know, I followed Aldougie's suggestions plus added my own, which were:
a) I asked my helper not to go to my son's room first thing in the morning, i.e. my husband and I are the first people my son saw when he woke up
b) I fed my son his first milk of the day (by this time I was no longer breastfeeding)
c) I then spent a little time with him playing before I get ready for work. At that point, my helper took over
d) When I got home from work, I took over from my helper. She would go to the kitchen to prepare dinner.
e) I gave my son his last feed of the day, then read him a book or sing a lullaby and put him to bed. We then have dinner (later on, as his bedtime got pushed back more and more, we would have dinner whilst he watched something "safe" on TV)
f) On weekends, my helper had no contact with my son unless necessary (e.g. when we were both dead tired and needed an afternoon snooze!)
It was very tiring because I was effectively doing two full time jobs - so my "work" day would start at 7am till 9pm, but I am happy to say that after about 2-3 months, my baby knew who his mum and dad were, especially his mum! Now looking back (my son is 3!) I was over-reacting, my son would have figured out on his own who mum and dad were, but then again, I have also heard "horror" stories from others; e.g. about how one 2.5 year old insisted that the helper helped her dress in the morning and not mummy, or the 3 year old who insisted the helper took him to pre-school and not mummy......
Good luck!