We also have done a mother/daughter tea...its actually become an annual event now for us. We plan it months and months in advance that way the moms and sometimes dad know to plan plan accordingly.
what we do is each family within our sorority will take on a table My fam...Angel fam had 3 tables and decorated it very angely with candles and that had decorated candle holders with our names on it. and we supplied the tea and cups and pots.
It was really cute to see all the different tables
We also had a slide show with pictures throughout the semester and sang "My Girl" but said "My mom"
...so fun and cute