Taking small kids on a trip is daunting: Where and how will everyone sleep? Can a rental cottage be baby-proofed? How will little ones used to a schedule and the structure of home deal with time zone changes and grandparents whose house rules differ from what they’re used to? In Part One of our three-part series on family travel, Sarah looks back on her extensive experience traveling with babies, toddlers, and kids--especially trips to the grandparents’ and in-laws’--and shares what worked, what didn’t, and what she’d do differently.