I was reading a Magazine "New Idea" from Australia, and I can't understand the reason why it have been used ing form. this is the text. "The power couple took to the waves of Hawaii recently, washing away persistent speculation about their sometimes rocky union. With children Jaden, 14, and Willow,12, in tow, the stars enjoyed some precious time together, proving a celebrity union doesn't always have a short expiry date!." If someone knows about what part of grammar is, I was thinking of Reduced relative clauses, but I think it's other rule.. thanks!!!