rc_cola,
"Ren" lo, wat to do as he is the caregiver, say too much may lead to further conflicts and argument..
for me, usually i will use soft approach, like treating the nanny better, eg buying her cakes and giving her vouchers etc, thou i cannot be sure that she will in turn treat my gal better but she probably will treat my gal worse if i were to reprimand or question her when my gal has bruises..
usually i will tell her that i hrd on the news or from someone that some child was beaten or knocked his head or etc etc so better watch out for eg the windows, the doors, mosquitoes, strings, plastic bags..many many
haha now u reali know how paranoid i m