Read the touching reason why this man had to propose to two sisters (See Photos)

When Will Seaton wanted to propose to his girlfriend, Ashley Schaus, he knew there was another person he needed to ask. Ashley and her sister, Hannah Schaus, who has Down syndrome and diabetes, are inseparable."I told him we were a package deal when we started dating in 2010," Ashley Schaus told ABC News.

Right from the beginning, she said, most of the couple's dates included Hannah. Over the years, "the three of us became best friends." 

It was this special bond that led Will to ask Hannah to be "best friends forever" right before proposing marriage to Ashley. He also gave both sisters rings: an engagement ring for Ashley and an heirloom -- the girls' grandmother's ring -- for Hannah.