Help with bridal party look!

My mother bought her dress yesterday, and I need advice as to how to match the flowers with it in such a way that the whole bridal party looks nice.

So far I plan to have white dress with red/mauve flowers, and the girls will have the reverse, red dresses and white flowers. FMIL has a champagne/peachy/beige kind of dress and my mom's dress is ivory. I originally planned to have both moms have flowers match their dress, but now I am not sure if I'll have too many color's in the bridal party... What do you guys think? And also the father's bout's would have to match the color of the mom's bouquets?

Thanks