asura,
After the groom come to fetch the brides to the in-laws place for tea, groom's mum (normally it's the case) will distribute ang pows to jiemeis & brothers, then come back to bride's home, bride's mum will give ang pows to jiemeis & brothers
then i think for the receptionist & emcee one, u can give ang pows to them b4 or after the dinner.