Should it be "Phyllis' and Belinda's husbands" instead?

Coincidentally, it turns out that both Phyllis and Belinda’s husbands are older than them by over a decade (11 years for Phyllis, and 15 for Belinda), and both named David too.

1. Should it be "Phyllis' and Belinda's husbands" instead?

2. Should it be "than they" instead?

Thanks!